diff --git a/.travis.yml b/.travis.yml
index 644b8dfb2363673770c2556607bad2ef32683522..a78853e15b15825354ffbc6e1ca8ffb10c5257c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -29,6 +29,7 @@ before_install:
 script:
   - paddle/scripts/travis/build.sh
   - paddle/scripts/travis/unittest.sh
+  - paddle/scripts/travis/make_install.sh
 notifications:
   email:
     on_success: change
diff --git a/paddle/gserver/dataproviders/PyDataProvider2.cpp b/paddle/gserver/dataproviders/PyDataProvider2.cpp
index f7886c4e014d77d4e908fb6aed859a33c1c0791f..8e51752dc29ee317dd268d6b7d444958e75ef88e 100644
--- a/paddle/gserver/dataproviders/PyDataProvider2.cpp
+++ b/paddle/gserver/dataproviders/PyDataProvider2.cpp
@@ -340,6 +340,7 @@ private:
 
       size_t additionalBatchSize = 1;
       if (calcBatchSize_) {
+        PyGuard guard;
         py::CallableHelper calcBatchSize(this->calcBatchSize_);
         calcBatchSize.setArgsSize(1);
         calcBatchSize.getArgs().set(0, data);
@@ -513,6 +514,7 @@ public:
       }
       {
         if (calcBatchSize_) {  // custom calc batch size.
+          PyGuard guard;
           Py_INCREF(data.back().get());
           py::CallableHelper calcBatchSize(calcBatchSize_);
           calcBatchSize.setArgsSize(1);
@@ -575,6 +577,11 @@ public:
       scanners[i]->finishFill(inArgs[i]);
     }
 
+    {
+      PyGuard g;
+      cache_->drop(&data);
+    }
+
     DBG << "Reading CPU Batch Done.";
 
     if (useGpu_) {
@@ -592,10 +599,6 @@ public:
       *batch = cpuBatch;
     }
 
-    {
-      PyGuard g;
-      cache_->drop(&data);
-    }
     return bsize;
   }
 };
diff --git a/paddle/scripts/submit_local.sh.in b/paddle/scripts/submit_local.sh.in
index eed2d315932c599231de9edcda26abe1bb4bf672..4cf5f41f195df7655c9e77eba23baf90e21cee13 100644
--- a/paddle/scripts/submit_local.sh.in
+++ b/paddle/scripts/submit_local.sh.in
@@ -43,6 +43,41 @@ fi
 
 export PYTHONPATH=${PWD}:${PYTHONPATH}
 
+
+# Check python lib installed or not.
+pip --help > /dev/null
+if [ $? -ne 0 ]; then
+    echo "pip should be installed to run paddle."
+    exit 1
+fi
+
+INSTALLED_VERSION=`pip freeze 2>/dev/null | grep '^paddle' | sed 's/.*==//g'`
+
+if [ -z ${INSTALLED_VERSION} ]; then
+   INSTALLED_VERSION="0.0.0"  # not installed
+fi
+cat <<EOF | python -
+from distutils.version import LooseVersion
+import sys
+if LooseVersion("${INSTALLED_VERSION}") < LooseVersion("@PADDLE_VERSION@"):
+  sys.exit(1)
+else:
+  sys.exit(0)
+EOF
+
+if [ $? -eq 1 ]; then  # Older version installed, or not installed at all
+   echo "First time run paddle, need to install some python dependencies."
+   BASEDIR=$(dirname "$0")
+   pip install ${BASEDIR}/../opt/paddle/share/wheels/*.whl
+   if [ $? -ne 0 ]; then
+      echo "pip install wheels failed. "
+      echo "Please use 'sudo paddle' at the first time you use PaddlePaddle"
+      echo "PaddlePaddle will install some python dependencies automatically."
+      exit 1
+   fi
+   echo "Python dependencies are installed."
+fi
+
 case "$1" in
     "train")
         ${DEBUGGER} $MYDIR/../opt/paddle/bin/paddle_trainer ${@:2}
diff --git a/paddle/scripts/travis/build.sh b/paddle/scripts/travis/build.sh
index 638b1bafb4398acd83870f5aba744cccf5da6f0a..a644f2a4164f870dc88af9b8f357f5a3fb306d7d 100755
--- a/paddle/scripts/travis/build.sh
+++ b/paddle/scripts/travis/build.sh
@@ -1,9 +1,5 @@
 #!/bin/bash
-
 cd `dirname $0`
-cd ../../../
-set -e
-mkdir build
-cd build
+source ./common.sh
 cmake .. -DCMAKE_BUILD_TYPE=Debug -DWITH_GPU=OFF -DWITH_DOC=OFF -DWITH_TESTING=ON -DON_TRAVIS=ON
 make -j `nproc`
diff --git a/paddle/scripts/travis/common.sh b/paddle/scripts/travis/common.sh
new file mode 100755
index 0000000000000000000000000000000000000000..37e27d665b12fb5b3b8ec7ad245d4587cb0361d6
--- /dev/null
+++ b/paddle/scripts/travis/common.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+set -e
+mkdir -p ../../../build
+cd ../../../build
+
diff --git a/paddle/scripts/travis/make_install.sh b/paddle/scripts/travis/make_install.sh
new file mode 100755
index 0000000000000000000000000000000000000000..08b2a648bb97de2c4f39c64efb9a41829faae0be
--- /dev/null
+++ b/paddle/scripts/travis/make_install.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+cd `dirname $0`
+source ./common.sh
+sudo make install
+sudo paddle version
diff --git a/paddle/scripts/travis/unittest.sh b/paddle/scripts/travis/unittest.sh
index a095e308f32eea159ec27ef96b5ea1368641739a..45e8c85c1028efb98433ebc383931def30fae416 100755
--- a/paddle/scripts/travis/unittest.sh
+++ b/paddle/scripts/travis/unittest.sh
@@ -1,6 +1,5 @@
 #!/bin/bash
-set -e
 cd `dirname $0`
-cd ../../../build
+source ./common.sh
 env CTEST_OUTPUT_ON_FAILURE=1 make test ARGS="-j `nproc`"
 
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index c8e3ecd41cedac4b80fbf98688152f6d4a766877..68cc40247041093d3eec6dc93b22d358f4cbbaa1 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -22,10 +22,6 @@ find_python_module(pip REQUIRED)
 find_python_module(wheel REQUIRED)
 find_python_module(google.protobuf REQUIRED)
 
-install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} setup.py install -f
-    WORKING_DIRECTORY
-    ${CMAKE_CURRENT_BINARY_DIR})")
-
 install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/dist/
     DESTINATION opt/paddle/share/wheels
 )