diff --git a/vnpy/app/cta_crypto/back_testing.py b/vnpy/app/cta_crypto/back_testing.py
index 2e56b72d..c6757a5f 100644
--- a/vnpy/app/cta_crypto/back_testing.py
+++ b/vnpy/app/cta_crypto/back_testing.py
@@ -41,7 +41,8 @@ from vnpy.trader.object import (
     TickData,
     OrderData,
     TradeData,
-    ContractData
+    ContractData,
+    PositionData
 )
 from vnpy.trader.constant import (
     Exchange,
@@ -127,10 +128,6 @@ class BackTestingEngine(object):
 
         self.order_strategy_dict = {}  # orderid 与 strategy的映射
 
-        # 持仓缓存字典
-        # key为vt_symbol，value为PositionBuffer对象
-        self.pos_holding_dict = {}
-
         self.trade_count = 0  # 成交编号
         self.trade_dict = OrderedDict()  # 用于统计成交收益时，还没处理得交易
         self.trades = OrderedDict()  # 记录所有得成交记录
@@ -139,7 +136,7 @@ class BackTestingEngine(object):
         self.long_position_list = []  # 多单持仓
         self.short_position_list = []  # 空单持仓
 
-        self.holdings = {}  # 多空持仓
+        self.positions = {}  # 账号持仓，对象为PositionData
 
         # 当前最新数据，用于模拟成交用
         self.gateway_name = u'BackTest'
@@ -388,13 +385,13 @@ class BackTestingEngine(object):
     def get_exchange(self, symbol: str):
         return self.symbol_exchange_dict.get(symbol, Exchange.LOCAL)
 
-    def get_position_holding(self, vt_symbol: str, gateway_name: str = ''):
-        """ 查询合约在账号的持仓（包含多空）"""
+    def get_position(self, vt_symbol: str, direction: Direction, gateway_name: str = ''):
+        """ 查询合约在账号的持仓"""
         if not gateway_name:
             gateway_name = self.gateway_name
-        k = f'{gateway_name}.{vt_symbol}'
-        holding = self.holdings.get(k, None)
-        if not holding:
+        k = f'{gateway_name}.{vt_symbol}.{direction.value}'
+        pos = self.positions.get(k, None)
+        if not pos:
             contract = self.get_contract(vt_symbol)
             if not contract:
                 self.write_log(f'{vt_symbol}合约信息不存在，构造一个')
@@ -413,9 +410,14 @@ class BackTestingEngine(object):
                                         size=self.get_size(vt_symbol),
                                         pricetick=self.get_price_tick(vt_symbol),
                                         margin_rate=self.get_margin_rate(vt_symbol))
-            holding = PositionHolding(contract)
-            self.holdings[k] = holding
-        return holding
+            pos = PositionData(
+                gateway_name=gateway_name,
+                symbol=contract.symbol,
+                exchange=contract.exchange,
+                direction=direction
+            )
+            self.positions[k] = pos
+        return pos
 
     def set_name(self, test_name):
         """
@@ -1081,9 +1083,13 @@ class BackTestingEngine(object):
             self.append_trade(trade)
 
             # 更新持仓缓存数据
-            k = '.'.join([self.gateway_name, trade.vt_symbol])
-            holding = self.get_position_holding(trade.vt_symbol, self.gateway_name)
-            holding.update_trade(trade)
+            pos = self.get_position(vt_symbol=trade.vt_symbol,direction=Direction.NET)
+            pre_volume = pos.volume
+            if trade.direction == Direction.LONG:
+                pos.volume = round(pos.volume + trade.volume, 7)
+            else:
+                pos.volume = round(pos.volume - trade.volume, 7)
+            self.write_log(f'{trade.vt_symbol} volume:{pre_volume} => {pos.volume}')
 
             strategy.on_trade(trade)
 
@@ -1160,22 +1166,27 @@ class BackTestingEngine(object):
                 trade.strategy_name = strategy.strategy_name
 
                 # 更新持仓缓存数据
-                k = '.'.join([self.gateway_name, trade.vt_symbol])
-                holding = self.get_position_holding(trade.vt_symbol, self.gateway_name)
-                holding.update_trade(trade)
-                strategy.on_trade(trade)
+                pos = self.get_position(vt_symbol=trade.vt_symbol, direction=Direction.NET)
+                pre_volume = pos.volume
+                if trade.direction == Direction.LONG:
+                    pos.volume = round(pos.volume + trade.volume, 7)
+                else:
+                    pos.volume = round(pos.volume - trade.volume, 7)
+                self.write_log(f'{trade.vt_symbol} volume:{pre_volume} => {pos.volume}')
 
                 self.trade_dict[trade.vt_tradeid] = trade
                 self.trades[trade.vt_tradeid] = copy.copy(trade)
                 self.write_log(u'vt_trade_id:{0}'.format(trade.vt_tradeid))
 
-                self.write_log(u'{} : crossLimitOrder: TradeId:{},  posBuffer = {}'.format(trade.strategy_name,
+                self.write_log(u'{} : crossLimitOrder: TradeId:{}'.format(trade.strategy_name,
                                                                                            trade.tradeid,
-                                                                                           holding.to_str()))
+                                                                                           ))
 
                 # 写入交易记录
                 self.append_trade(trade)
 
+                strategy.on_trade(trade)
+
                 # 更新资金曲线
                 fund_kline = self.get_fund_kline(trade.strategy_name)
                 if fund_kline:
@@ -1193,20 +1204,6 @@ class BackTestingEngine(object):
         # 实时计算模式
         self.realtime_calculate()
 
-    def update_pos_buffer(self):
-        """更新持仓信息,把今仓=>昨仓"""
-
-        for k, v in self.pos_holding_dict.items():
-            if v.long_td > 0:
-                self.write_log(u'调整多单持仓:今仓{}=> 0 昨仓{} => 昨仓:{}'.format(v.long_td, v.long_yd, v.long_pos))
-                v.long_td = 0
-                v.longYd = v.long_pos
-
-            if v.short_td > 0:
-                self.write_log(u'调整空单持仓:今仓{}=> 0 昨仓{} => 昨仓:{}'.format(v.short_td, v.short_yd, v.short_pos))
-                v.short_td = 0
-                v.short_yd = v.short_pos
-
     def get_data_path(self):
         """
         获取数据保存目录
@@ -1842,19 +1839,6 @@ class BackTestingEngine(object):
         else:
             self.write_log(msg)
 
-        # 今仓 =》 昨仓
-        for holding in self.holdings.values():
-            if holding.long_td > 0:
-                self.write_log(
-                    f'{holding.vt_symbol} 多单今仓{holding.long_td},昨仓:{holding.long_yd}=> 昨仓:{holding.long_pos}')
-                holding.long_td = 0
-                holding.long_yd = holding.long_pos
-            if holding.short_td > 0:
-                self.write_log(
-                    f'{holding.vt_symbol} 空单今仓{holding.short_td},昨仓:{holding.short_yd}=> 昨仓:{holding.short_pos}')
-                holding.short_td = 0
-                holding.short_yd = holding.short_pos
-
     # ---------------------------------------------------------------------
     def export_trade_result(self):
         """
diff --git a/vnpy/app/cta_crypto/engine.py b/vnpy/app/cta_crypto/engine.py
index 9367d2f1..8f6ede37 100644
--- a/vnpy/app/cta_crypto/engine.py
+++ b/vnpy/app/cta_crypto/engine.py
@@ -138,7 +138,7 @@ class CtaEngine(BaseEngine):
 
         self.vt_tradeids = set()  # for filtering duplicate trade
 
-        self.holdings = {}
+        self.positions = {}
 
         self.last_minute = None
 
@@ -243,9 +243,6 @@ class CtaEngine(BaseEngine):
         """"""
         order = event.data
 
-        holding = self.get_position_holding(order.vt_symbol, order.gateway_name)
-        holding.update_order(order)
-
         strategy = self.orderid_strategy_map.get(order.vt_orderid, None)
         if not strategy:
             return
@@ -282,9 +279,6 @@ class CtaEngine(BaseEngine):
             return
         self.vt_tradeids.add(trade.vt_tradeid)
 
-        holding = self.get_position_holding(trade.vt_symbol, trade.gateway_name)
-        holding.update_trade(trade)
-
         strategy = self.orderid_strategy_map.get(trade.vt_orderid, None)
         if not strategy:
             return
@@ -341,8 +335,7 @@ class CtaEngine(BaseEngine):
         """"""
         position = event.data
 
-        holding = self.get_position_holding(position.vt_symbol, position.gateway_name)
-        holding.update_position(position)
+        self.positions.update({position.vt_positionid: position})
 
     def check_unsubscribed_symbols(self):
         """检查未订阅合约"""
@@ -786,7 +779,7 @@ class CtaEngine(BaseEngine):
         contract = self.main_engine.get_contract(vt_symbol)
         if contract is None:
             self.write_error(f'查询不到{vt_symbol}合约信息')
-            return 0.1
+            return 0.001
 
         return contract.pricetick
 
@@ -796,7 +789,7 @@ class CtaEngine(BaseEngine):
         contract = self.main_engine.get_contract(vt_symbol)
         if contract is None:
             self.write_error(f'查询不到{vt_symbol}合约信息')
-            return 1
+            return 0.01
 
         return contract.min_volume
 
@@ -832,22 +825,14 @@ class CtaEngine(BaseEngine):
 
     def get_position(self, vt_symbol: str, direction: Direction, gateway_name: str = ''):
         """ 查询合约在账号的持仓,需要指定方向"""
+        contract = self.main_engine.get_contract(vt_symbol)
+        if contract:
+            if contract.gateway_name and not gateway_name:
+                gateway_name = contract.gateway_name
+
         vt_position_id = f"{gateway_name}.{vt_symbol}.{direction.value}"
         return self.main_engine.get_position(vt_position_id)
 
-    def get_position_holding(self, vt_symbol: str, gateway_name: str = ''):
-        """ 查询合约在账号的持仓（包含多空）"""
-        k = f'{gateway_name}.{vt_symbol}'
-        holding = self.holdings.get(k, None)
-        if not holding:
-            symbol, exchange = extract_vt_symbol(vt_symbol)
-
-            contract = self.main_engine.get_contract(vt_symbol)
-
-            holding = PositionHolding(contract)
-            self.holdings[k] = holding
-        return holding
-
     def get_engine_type(self):
         """"""
         return self.engine_type
@@ -1498,19 +1483,15 @@ class CtaEngine(BaseEngine):
 
         compare_pos = dict()  # vt_symbol: {'账号多单': xx, '账号空单':xxx, '策略空单':[], '策略多单':[]}
 
-        for holding_key in list(self.holdings.keys()):
+        for position in list(self.positions.values()):
             # gateway_name.symbol.exchange => symbol.exchange
-            vt_symbol = '.'.join(holding_key.split('.')[-2:])
-
+            vt_symbol = position.vt_symbol
             vt_symbols.add(vt_symbol)
-            holding = self.holdings.get(holding_key, None)
-            if holding is None:
-                continue
 
             compare_pos[vt_symbol] = OrderedDict(
                 {
-                    "账号空单": holding.short_pos,
-                    '账号多单': holding.long_pos,
+                    "账号空单": abs(position.volume) if position.volume < 0 else 0,
+                    '账号多单': position.volume if position.volume > 0 else 0,
                     '策略空单': 0,
                     '策略多单': 0,
                     '空单策略': [],
diff --git a/vnpy/app/cta_crypto/portfolio_testing.py b/vnpy/app/cta_crypto/portfolio_testing.py
index e192115d..b0a367b6 100644
--- a/vnpy/app/cta_crypto/portfolio_testing.py
+++ b/vnpy/app/cta_crypto/portfolio_testing.py
@@ -279,8 +279,7 @@ class PortfolioTestingEngine(BackTestingEngine):
 
                         # 第二个交易日,撤单
                         self.cancel_orders()
-                        # 更新持仓缓存
-                        self.update_pos_buffer()
+
 
                         gc_collect_days += 1
                         if gc_collect_days >= 10:
diff --git a/vnpy/app/cta_crypto/template.py b/vnpy/app/cta_crypto/template.py
index 132d4478..57744f47 100644
--- a/vnpy/app/cta_crypto/template.py
+++ b/vnpy/app/cta_crypto/template.py
@@ -997,7 +997,9 @@ class CtaFutureTemplate(CtaTemplate):
         """
         self.write_log(u'执行事务平多仓位:{}'.format(grid.to_json()))
 
-        self.account_pos = self.cta_engine.get_position_holding(self.vt_symbol)
+        self.account_pos = self.cta_engine.get_position(
+            vt_symbol=self.vt_symbol,
+            direction=Direction.NET)
 
         if self.account_pos is None:
             self.write_error(u'无法获取{}得持仓信息'.format(self.vt_symbol))
@@ -1050,7 +1052,9 @@ class CtaFutureTemplate(CtaTemplate):
         """
         self.write_log(u'执行事务平空仓位:{}'.format(grid.to_json()))
 
-        self.account_pos = self.cta_engine.get_position_holding(self.vt_symbol)
+        self.account_pos = self.cta_engine.get_position(
+            vt_symbol=self.vt_symbol,
+            direction=Direction.NET)
         if self.account_pos is None:
             self.write_error(u'无法获取{}得持仓信息'.format(self.vt_symbol))
             return False
@@ -1064,17 +1068,21 @@ class CtaFutureTemplate(CtaTemplate):
         # 发出cover委托
         if grid.traded_volume > 0:
             grid.volume -= grid.traded_volume
+            grid.volume = round(grid.volume, 7)
             grid.traded_volume = 0
 
-        grid.volume = round(grid.volume, 7)
-
-        if 0 < abs(self.account_pos.short_pos) < grid.volume:
-            self.write_error(u'当前{}的空单持仓:{}，不满足平仓目标:{}, 强制降低'
+        if self.account_pos.volume >= 0:
+            self.write_error(u'当前{}的净持仓:{}，不能平空单'
                              .format(self.vt_symbol,
-                                     self.account_pos.short_pos,
+                                     self.account_pos.volume))
+            return False
+        if abs(self.account_pos.volume) < grid.volume:
+            self.write_error(u'当前{}的净持仓:{}，不满足平仓目标:{}, 强制降低'
+                             .format(self.vt_symbol,
+                                     self.account_pos.volume,
                                      grid.volume))
 
-            grid.volume = abs(self.account_pos.short_pos)
+            grid.volume = abs(self.account_pos.volume)
 
         vt_orderids = self.cover(
             price=cover_price,
diff --git a/vnpy/component/cta_line_bar.py b/vnpy/component/cta_line_bar.py
index d1d7279c..86be7891 100644
--- a/vnpy/component/cta_line_bar.py
+++ b/vnpy/component/cta_line_bar.py
@@ -77,11 +77,12 @@ class CtaLineBar(object):
     self.lineM = None                       # 1分钟K线
     lineMSetting = {}
     lineMSetting['name'] = u'M1'
+    lineMSetting['interval'] = Interval.MINUTE
     lineMSetting['bar_interval'] = 60    # 1分钟对应60秒
-    lineMSetting['inputEma1Len'] = 7        # EMA线1的周期
-    lineMSetting['inputEma2Len'] = 21       # EMA线2的周期
-    lineMSetting['inputBollLen'] = 20       # 布林特线周期
-    lineMSetting['inputBollStdRate'] = 2    # 布林特线标准差
+    lineMSetting['para_ema1_len'] = 7        # EMA线1的周期
+    lineMSetting['para_ema2_len'] = 21       # EMA线2的周期
+    lineMSetting['para_boll_len'] = 20       # 布林特线周期
+    lineMSetting['para_boll_std_rate'] = 2    # 布林特线标准差
     lineMSetting['price_tick'] = self.price_tick  # 最小条
     lineMSetting['underlying_symbol'] = self.underlying_symbol  #商品短号
     self.lineM = CtaLineBar(self, self.onBar, lineMSetting)
@@ -207,7 +208,7 @@ class CtaLineBar(object):
             # 修正精度
             if self.price_tick < 1:
                 exponent = decimal.Decimal(str(self.price_tick))
-                self.round_n = max(abs(exponent.as_tuple().exponent), 4)
+                self.round_n = max(abs(exponent.as_tuple().exponent) + 2, 4)
 
             # 导入卡尔曼过滤器
             if self.para_active_kf:
diff --git a/vnpy/gateway/binancef/binancef_gateway.py b/vnpy/gateway/binancef/binancef_gateway.py
index ca179521..fc555529 100644
--- a/vnpy/gateway/binancef/binancef_gateway.py
+++ b/vnpy/gateway/binancef/binancef_gateway.py
@@ -494,10 +494,13 @@ class BinancefRestApi(RestClient):
         for asset in data["assets"]:
             account = AccountData(
                 accountid=asset["asset"],
-                balance=float(asset["walletBalance"]),
+                balance=float(asset["walletBalance"]) + float(asset["maintMargin"]),
                 frozen=float(asset["maintMargin"]),
+                holding_profit=float(asset['unrealizedProfit']),
                 gateway_name=self.gateway_name
             )
+            # 修正vnpy AccountData
+            account.balance += account.holding_profit
 
             if account.balance:
                 self.gateway.on_account(account)
@@ -516,69 +519,18 @@ class BinancefRestApi(RestClient):
         """"""
         for d in data:
             volume = float(d["positionAmt"])
-
-            if volume > 0:
-                long_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.LONG,
-                    volume=abs(volume),
-                    price=float(d["entryPrice"]),
-                    pnl=float(d["unRealizedProfit"]),
-                    gateway_name=self.gateway_name,
-                )
-                short_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.SHORT,
-                    volume=0,
-                    price=0,
-                    pnl=0,
-                    gateway_name=self.gateway_name,
-                )
-            elif volume < 0:
-                long_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.LONG,
-                    volume=0,
-                    price=0,
-                    pnl=0,
-                    gateway_name=self.gateway_name,
-                )
-                short_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.SHORT,
-                    volume=abs(volume),
-                    price=float(d["entryPrice"]),
-                    pnl=float(d["unRealizedProfit"]),
-                    gateway_name=self.gateway_name,
-                )
-            else:
-                long_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.LONG,
-                    volume=0,
-                    price=0,
-                    pnl=0,
-                    gateway_name=self.gateway_name,
-                )
-                short_position = PositionData(
-                    symbol=d["symbol"],
-                    exchange=Exchange.BINANCE,
-                    direction=Direction.SHORT,
-                    volume=0,
-                    price=0,
-                    pnl=0,
-                    gateway_name=self.gateway_name,
-                )
-
-            self.gateway.on_position(long_position)
-            self.gateway.on_position(short_position)
-
-       # self.gateway.write_log("持仓信息查询成功")
+            position = PositionData(
+                symbol=d["symbol"],
+                exchange=Exchange.BINANCE,
+                direction=Direction.NET,
+                volume=volume,
+                price=float(d["entryPrice"]),
+                pnl=float(d["unRealizedProfit"]),
+                gateway_name=self.gateway_name,
+            )
+            self.gateway.on_position(position)
+          
+        # self.gateway.write_log("持仓信息查询成功")
 
     def on_query_order(self, data: dict, request: Request) -> None:
         """"""
@@ -831,15 +783,34 @@ class BinancefTradeWebsocketApi(WebsocketClient):
 
     def on_account(self, packet: dict) -> None:
         """"""
+        holding_pnl = 0
+        for pos_data in packet["a"]["P"]:
+            print(pos_data)
+            volume = float(pos_data["pa"])
+            position = PositionData(
+                symbol=pos_data["s"],
+                exchange=Exchange.BINANCE,
+                direction=Direction.NET,
+                volume=abs(volume),
+                price=float(pos_data["ep"]),
+                pnl=float(pos_data["cr"]),
+                gateway_name=self.gateway_name,
+            )
+            holding_pnl += float(pos_data['up'])
+            self.gateway.on_position(position)
+
         for acc_data in packet["a"]["B"]:
             account = AccountData(
                 accountid=acc_data["a"],
-                balance=float(acc_data["wb"]),
+                balance=round(float(acc_data["wb"]), 7),
                 frozen=float(acc_data["wb"]) - float(acc_data["cw"]),
+                holding_profit=round(holding_pnl, 7),
                 gateway_name=self.gateway_name
             )
 
             if account.balance:
+                account.balance += account.holding_profit
+                account.available = float(acc_data["cw"])
                 self.gateway.on_account(account)
 
         for pos_data in packet["a"]["P"]:
diff --git a/vnpy/trader/converter.py b/vnpy/trader/converter.py
index 761a3735..e9709286 100644
--- a/vnpy/trader/converter.py
+++ b/vnpy/trader/converter.py
@@ -130,11 +130,11 @@ class PositionHolding:
         if position.direction == Direction.LONG:
             self.long_pos = position.volume
             self.long_yd = position.yd_volume
-            self.long_td = self.long_pos - self.long_yd
+            self.long_td = round(self.long_pos - self.long_yd, 7)
         else:
             self.short_pos = position.volume
             self.short_yd = position.yd_volume
-            self.short_td = self.short_pos - self.short_yd
+            self.short_td = round(self.short_pos - self.short_yd, 7)
 
     def update_order(self, order: OrderData) -> None:
         """"""
@@ -211,7 +211,7 @@ class PositionHolding:
             if order.offset == Offset.OPEN:
                 continue
 
-            frozen = order.volume - order.traded
+            frozen = round(order.volume - order.traded, 7)
 
             if order.direction == Direction.LONG:
                 if order.offset == Offset.CLOSETODAY:
@@ -238,8 +238,8 @@ class PositionHolding:
                                                 - self.long_td)
                         self.long_td_frozen = self.long_td
 
-            self.long_pos_frozen = self.long_td_frozen + self.long_yd_frozen
-            self.short_pos_frozen = self.short_td_frozen + self.short_yd_frozen
+            self.long_pos_frozen = round(self.long_td_frozen + self.long_yd_frozen, 7)
+            self.short_pos_frozen = round(self.short_td_frozen + self.short_yd_frozen, 7)
 
     def convert_order_request_shfe(self, req: OrderRequest) -> List[OrderRequest]:
         """上期所，委托单拆分"""
diff --git a/vnpy/trader/ui/widget.py b/vnpy/trader/ui/widget.py
index 2c8bbee1..08a71c82 100644
--- a/vnpy/trader/ui/widget.py
+++ b/vnpy/trader/ui/widget.py
@@ -750,7 +750,7 @@ class TradingWidget(QtWidgets.QWidget):
             self.return_label.setText(f"{r:.2f}%")
 
         if tick.bid_price_2:
-            self.bp2_label.setText(str(round(tick.bid_price_2), 7))
+            self.bp2_label.setText(str(round(tick.bid_price_2, 7)))
             self.bv2_label.setText(str(round(tick.bid_volume_2, 7)))
             self.ap2_label.setText(str(round(tick.ask_price_2, 7)))
             self.av2_label.setText(str(round(tick.ask_volume_2, 7)))