diff --git a/python/paddle/v2/fluid/distribute_transpiler.py b/python/paddle/v2/fluid/distribute_transpiler.py
index 58d32bac1257ab25f406ab37948d532b84d4ded8..7f3da674633884d5a275a952c07d5a4a8e0f138c 100644
--- a/python/paddle/v2/fluid/distribute_transpiler.py
+++ b/python/paddle/v2/fluid/distribute_transpiler.py
@@ -56,6 +56,8 @@ def split_dense_variable(var_list,
                 (block_id) * block_size))
             block = VarBlock(var.name, block_id, curr_block_size)
             blocks.append(str(block))
+        print("$$ splited var: ", var.name, var.shape, split_count, len(blocks),
+              block_size)
     return blocks
 
 
@@ -132,10 +134,12 @@ class DistributeTranspiler:
 
         # step4
         for varname, splited_var in param_var_mapping.iteritems():
+            if len(splited_var) <= 1:
+                continue
             orig_param = program.global_block().vars[varname]
             concat = program.global_block().append_op(
                 type="concat",
-                inputs={"X": send_outputs},
+                inputs={"X": splited_var},
                 outputs={"Out": orig_param},
                 attrs={"axis": 0})
 
@@ -147,28 +151,29 @@ class DistributeTranspiler:
             if not block_map.has_key(varname):
                 block_map[varname] = []
             block_map[varname].append((long(offset), long(size)))
-
         for varname, splited in block_map.iteritems():
             orig_var = program.global_block().vars[varname]
+            var_mapping[varname] = []
+            if len(splited) == 1:
+                var_mapping[varname] = [orig_var]
+                continue
             orig_shape = orig_var.shape
             orig_dim1_flatten = 1
             if len(orig_shape) >= 2:
                 orig_dim1_flatten = reduce(lambda x, y: x * y, orig_shape[1:])
-            var_list = []
+
             for i, block in enumerate(splited):
                 size = block[1]
                 rows = size / orig_dim1_flatten
                 splited_shape = [rows]
                 if len(orig_shape) >= 2:
                     splited_shape.extend(orig_shape[1:])
-                print("block, splited shape:", block, splited_shape)
                 var = program.global_block().create_var(
                     name="%s.block%d" % (varname, i),
                     psersistable=False,
                     dtype=orig_var.dtype,
                     shape=splited_shape)  # flattend splited var
-                var_list.append(var)
-            var_mapping[varname] = var_list
+                var_mapping[varname].append(var)
         return var_mapping
 
     def _clone_param(self, block, v):
@@ -199,7 +204,8 @@ class DistributeTranspiler:
     def _append_split_op(self, program, gradblocks):
         var_mapping = self._create_vars_from_blocklist(program, gradblocks)
         for varname, splited_vars in var_mapping.iteritems():
-            if len(splited_vars) == 1:
+            # variable that don't need to split have empty splited_vars
+            if len(splited_vars) <= 1:
                 continue
             orig_var = program.global_block().vars[varname]
             sections = []