diff --git a/cmake/external/grpc.cmake b/cmake/external/grpc.cmake
index 9459f1ddfe85f5607880d3fdd968b494d6af592a..4b6840578fd155027c895b6ed5d1f9133868f312 100644
--- a/cmake/external/grpc.cmake
+++ b/cmake/external/grpc.cmake
@@ -33,10 +33,18 @@ ELSE()
   SET(BUILD_CMD make HAS_SYSTEM_PROTOBUF=false -s -j ${NUM_OF_PROCESSOR} static grpc_cpp_plugin)
 ENDIF()
 
+# FIXME(wuyi): do not build zlib cares protobuf twice, find a way to build grpc with them
 ExternalProject_Add(
     extern_grpc
     DEPENDS protobuf zlib
-    URL "http://paddlepaddledeps.bj.bcebos.com/grpc.tar.xz"
+    # NOTE(wuyi):
+    # this package is generated by following steps:
+    # 1. git clone -b v1.8.x https://github.com/grpc/grpc.git
+    # 2. submodule update --init
+    # 3. keep only zlib, cares, protobuf, boringssl under "third_party",
+    #    checkout and clean other dirs under third_party
+    # 4. remove .git, and package the directory.
+    URL "http://paddlepaddledeps.bj.bcebos.com/grpc-v1.8.x.tar.gz"
     PREFIX          ${GRPC_SOURCES_DIR}
     UPDATE_COMMAND  ""
     CONFIGURE_COMMAND ""
@@ -49,7 +57,6 @@ ExternalProject_Add(
     INSTALL_COMMAND make prefix=${GRPC_INSTALL_DIR} install
 )
 
-# FIXME(typhoonzero): hack to get static lib path, try a better way like merge them.
 ADD_LIBRARY(grpc++_unsecure STATIC IMPORTED GLOBAL)
 SET_PROPERTY(TARGET grpc++_unsecure PROPERTY IMPORTED_LOCATION
              "${GRPC_INSTALL_DIR}/lib/libgrpc++_unsecure.a")
diff --git a/python/paddle/fluid/transpiler/distribute_transpiler.py b/python/paddle/fluid/transpiler/distribute_transpiler.py
index 06b0a1375ce6568cca864cd8a2dd69ee46b223a7..819073257c584692b2316f0703255d2ef7777915 100644
--- a/python/paddle/fluid/transpiler/distribute_transpiler.py
+++ b/python/paddle/fluid/transpiler/distribute_transpiler.py
@@ -186,12 +186,17 @@ class DistributeTranspiler:
 
         param_list = []
         grad_list = []
+        param_grad_set = set()
         for p, g in self.params_grads:
             # skip parameter marked not trainable
             if type(p) == Parameter and p.trainable == False:
                 continue
-            param_list.append(p)
-            grad_list.append(g)
+            if p.name not in param_grad_set:
+                param_list.append(p)
+                param_grad_set.add(p.name)
+            if g.name not in param_grad_set:
+                grad_list.append(g)
+                param_grad_set.add(g.name)
 
         self._update_dist_lookup_table_vars(param_list, grad_list,
                                             self.params_grads)
@@ -802,6 +807,9 @@ class DistributeTranspiler:
             if not block_map.has_key(varname):
                 block_map[varname] = []
             block_map[varname].append((long(offset), long(size)))
+        # Do not remove this important debug message:
+        print("block map: %s" % block_map)
+
         for varname, splited in block_map.iteritems():
             orig_var = program.global_block().var(varname)
             if len(splited) == 1: