diff --git a/python/paddle/fluid/io.py b/python/paddle/fluid/io.py
index 954eb0ea62081b0c39f8a4781a44d3a74b62a623..7f24938d20823a9a5d53fbd28cac4593cc9670a4 100644
--- a/python/paddle/fluid/io.py
+++ b/python/paddle/fluid/io.py
@@ -762,10 +762,10 @@ def get_test_program(filelist, program=None, startup_program=None):
         new_var.persistable = True
         return new_var
 
-    def get_test_reader_name(train_reader_name):
+    def _get_test_reader_name(train_reader_name):
         return train_reader_name + "_test"
 
-    def is_reader_op(op):
+    def _is_reader_op(op):
         block = op.block
         if "Out" in op.output_names:
             reader_out = block.vars[op.output("Out")[0]]
@@ -783,7 +783,7 @@ def get_test_program(filelist, program=None, startup_program=None):
     startup_reader_op_list = []
 
     for op in startup_block.ops:
-        if is_reader_op(op):
+        if _is_reader_op(op):
             startup_reader_op_list.append(op)
 
     if len(startup_reader_op_list) == 0:
@@ -799,7 +799,7 @@ def get_test_program(filelist, program=None, startup_program=None):
         test_reader = _copy_reader_var_(
             startup_block,
             train_reader,
-            new_name=get_test_reader_name(train_reader_name))
+            new_name=_get_test_reader_name(train_reader_name))
         train_test_reader_map[train_reader.name] = test_reader
 
         test_op_inputs = {}
@@ -830,7 +830,7 @@ def get_test_program(filelist, program=None, startup_program=None):
     for var in main_block.vars.values():
         if var.type == core.VarDesc.VarType.READER:
             main_block.rename_var(
-                str(var.name), str(get_test_reader_name(var.name)))
+                str(var.name), str(_get_test_reader_name(var.name)))
 
     for op in main_block.ops:
         if op.type == root_reader_op.type: