diff --git a/.travis.yml b/.travis.yml
index b2c8936d..bf5bd5bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,10 @@ dist: xenial  # required for Python >= 3.7 (travis-ci/travis-ci#9069)
 python:
   - "3.7"
 
+script:
+  # todo: use python unittest
+  - mkdir run; cd run; python ../tests/load_all.py
+
 matrix:
   include:
     - name: "code quality analysis: flake8"
@@ -23,11 +27,9 @@ matrix:
       before_install:
         - choco install python3 --version 3.7.2
       install:
+        - python -m pip install --upgrade pip wheel setuptools
         - pip install -r requirements.txt
         - pip install .
-      script:
-        # todo: use python unittest
-        - mkdir run; cd run; python -c "import vnpy.api.ctp.vnctpmd; import vnpy.api.oes.vnoes; exit(0);"
 
     - name: "pip install under Ubuntu: gcc-8"
       before_install:
@@ -41,10 +43,8 @@ matrix:
         - sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++-8 90
         - sudo update-alternatives --install /usr/bin/gcc cc /usr/bin/gcc-8 90
         # Linux install script
+        - python -m pip install --upgrade pip wheel setuptools
         - bash ./install.sh
-      script:
-        # todo: use python unittest
-        - mkdir run; cd run; python -c "import vnpy.api.ctp.vnctpmd; import vnpy.api.oes.vnoes; exit(0);"
 
     - name: "pip install under Ubuntu: gcc-7"
       before_install:
@@ -58,8 +58,5 @@ matrix:
         - sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++-7 90
         - sudo update-alternatives --install /usr/bin/gcc cc /usr/bin/gcc-7 90
         # Linux install script
+        - python -m pip install --upgrade pip wheel setuptools
         - bash ./install.sh
-      script:
-        # todo: use python unittest
-        - mkdir run; cd run; python -c "import vnpy.api.ctp.vnctpmd; import vnpy.api.oes.vnoes; exit(0);"
-
diff --git a/requirements.txt b/requirements.txt
index 7af2245d..4daceb87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,21 @@
 PyQt5<5.12
 dataclasses; python_version<="3.6"
 qdarkstyle
-futu-api
+requests
 websocket-client
 peewee
 numpy
 pandas
 matplotlib
 seaborn
-ta-lib
-ibapi
+futu-api
+tigeropen
+
+# ta-lib
+ta-lib; platform_system=="Linux"
+https://pip.vnpy.com/colletion/TA_Lib-0.4.17-cp37-cp37m-win_amd64.whl; platform_system=="Windows"
+
+# ibapi
+# todo: use cdn instead
+https://vnpy-pip.oss-cn-shanghai.aliyuncs.com/colletion/ibapi-9.75.1-py3-none-any.whl
 
diff --git a/tests/load_all.py b/tests/load_all.py
new file mode 100644
index 00000000..feae9c12
--- /dev/null
+++ b/tests/load_all.py
@@ -0,0 +1,26 @@
+# flake8: noqa
+import unittest
+
+
+class ImportTest(unittest.TestCase):
+
+    # noinspection PyUnresolvedReferences
+    def test_import_all(self):
+        from vnpy.event import EventEngine
+
+        from vnpy.trader.engine import MainEngine
+        from vnpy.trader.ui import MainWindow, create_qapp
+
+        from vnpy.gateway.bitmex import BitmexGateway
+        from vnpy.gateway.futu import FutuGateway
+        from vnpy.gateway.ib import IbGateway
+        from vnpy.gateway.ctp import CtpGateway
+        from vnpy.gateway.tiger import TigerGateway
+        from vnpy.gateway.oes import OesGateway
+
+        from vnpy.app.cta_strategy import CtaStrategyApp
+        from vnpy.app.csv_loader import CsvLoaderApp
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/vnpy/app/cta_strategy/ui/widget.py b/vnpy/app/cta_strategy/ui/widget.py
index e2511b9e..e4f2df1e 100644
--- a/vnpy/app/cta_strategy/ui/widget.py
+++ b/vnpy/app/cta_strategy/ui/widget.py
@@ -1,5 +1,3 @@
-from typing import Any
-
 from vnpy.event import Event, EventEngine
 from vnpy.trader.engine import MainEngine
 from vnpy.trader.ui import QtCore, QtGui, QtWidgets