diff --git a/vnpy/pricing/black.py b/vnpy/pricing/black.py
index c3bd8a2a..ecc5ae3e 100644
--- a/vnpy/pricing/black.py
+++ b/vnpy/pricing/black.py
@@ -68,7 +68,7 @@ def calculateTheta(f, k, r, t, v, cp):
     """计算Theta值"""
     price1 = calculatePrice(f, k, r, t*STEP_UP, v, cp)
     price2 = calculatePrice(f, k, r, t*STEP_DOWN, v, cp)
-    theta = (price1 - price2) * (t * STEP_DIFF * 240)
+    theta = -(price1 - price2) / (t * STEP_DIFF * 240)
     return theta
 
 #----------------------------------------------------------------------
@@ -76,7 +76,7 @@ def calculateVega(f, k, r, t, v, cp):
     """计算Vega值"""
     price1 = calculatePrice(f, k, r, t, v*STEP_UP, cp)
     price2 = calculatePrice(f, k, r, t, v*STEP_DOWN, cp)
-    vega = (price1 - price2) / (v * STEP_DIFF * 100)
+    vega = (price1 - price2) / (v * STEP_DIFF * 100) 
     return vega
 
 #----------------------------------------------------------------------
diff --git a/vnpy/trader/app/optionMaster/__init__.py b/vnpy/trader/app/optionMaster/__init__.py
index 5335fdb2..05ff3d30 100644
--- a/vnpy/trader/app/optionMaster/__init__.py
+++ b/vnpy/trader/app/optionMaster/__init__.py
@@ -7,4 +7,4 @@ appName = 'OptionMaster'
 appDisplayName = u'OptionMaster'
 appEngine = None
 appWidget = None
-appIco = 'rm.ico'
\ No newline at end of file
+appIco = 'om.ico'
\ No newline at end of file
diff --git a/vnpy/trader/app/optionMaster/om.ico b/vnpy/trader/app/optionMaster/om.ico
new file mode 100644
index 00000000..d8a4c0be
Binary files /dev/null and b/vnpy/trader/app/optionMaster/om.ico differ
diff --git a/vnpy/trader/app/optionMaster/omBase.py b/vnpy/trader/app/optionMaster/omBase.py
new file mode 100644
index 00000000..c7d557ec
--- /dev/null
+++ b/vnpy/trader/app/optionMaster/omBase.py
@@ -0,0 +1,3 @@
+# encoding: UTF-8
+
+