diff --git a/python/paddle/fluid/dygraph/dygraph_to_static/break_continue_transformer.py b/python/paddle/fluid/dygraph/dygraph_to_static/break_continue_transformer.py
index e9280954bf741935603ce5234af1010f6bbb4ce2..8d24060a88e20545c606b93c9c030da2cdb04586 100644
--- a/python/paddle/fluid/dygraph/dygraph_to_static/break_continue_transformer.py
+++ b/python/paddle/fluid/dygraph/dygraph_to_static/break_continue_transformer.py
@@ -19,7 +19,7 @@ import gast
 from paddle.fluid import unique_name
 from paddle.fluid.dygraph.dygraph_to_static.utils import get_constant_variable_node
 from paddle.fluid.dygraph.dygraph_to_static.utils import index_in_list
-from paddle.fluid.dygraph.dygraph_to_static.utils import ForNodeParser
+from paddle.fluid.dygraph.dygraph_to_static.utils import ForNodeVisitor
 from paddle.fluid.dygraph.dygraph_to_static.variable_trans_func import create_fill_constant_node
 
 __all__ = ['BreakContinueTransformer']
@@ -67,7 +67,7 @@ class ForToWhileTransformer(gast.NodeTransformer):
             node, gast.For), "Input node is NOT gast.For in get_for_stmt_nodes"
 
         # 1. parse current gast.For node
-        current_for_node_parser = ForNodeParser(node)
+        current_for_node_parser = ForNodeVisitor(node)
         stmts_tuple = current_for_node_parser.parse()
         if stmts_tuple is None:
             return [node]
diff --git a/python/paddle/fluid/dygraph/dygraph_to_static/loop_transformer.py b/python/paddle/fluid/dygraph/dygraph_to_static/loop_transformer.py
index 6c8b27625b5a450ccf194760a91b0cc1982978cf..d4d1ff6ba2db46298270b3dba36748bd6f92d3e8 100644
--- a/python/paddle/fluid/dygraph/dygraph_to_static/loop_transformer.py
+++ b/python/paddle/fluid/dygraph/dygraph_to_static/loop_transformer.py
@@ -28,7 +28,7 @@ from paddle.fluid.dygraph.dygraph_to_static.utils import generate_name_node
 from paddle.fluid.dygraph.dygraph_to_static.utils import get_constant_variable_node
 from paddle.fluid.dygraph.dygraph_to_static.utils import get_attribute_full_name
 from paddle.fluid.dygraph.dygraph_to_static.utils import is_control_flow_to_transform
-from paddle.fluid.dygraph.dygraph_to_static.utils import ForNodeParser
+from paddle.fluid.dygraph.dygraph_to_static.utils import ForNodeVisitor
 from paddle.fluid.dygraph.dygraph_to_static.utils import RenameTransformer
 from paddle.fluid.dygraph.dygraph_to_static.variable_trans_func import create_static_variable_gast_node
 from paddle.fluid.dygraph.dygraph_to_static.variable_trans_func import to_static_variable_gast_node
@@ -374,7 +374,7 @@ class LoopTransformer(gast.NodeTransformer):
         #   2). cond_stmt: node, condition node to judge whether continue loop
         #   3). body_stmts: list[node], updated loop body, sometimes we should change
         #       the original statement in body, not just append new statement
-        current_for_node_parser = ForNodeParser(node)
+        current_for_node_parser = ForNodeVisitor(node)
         stmts_tuple = current_for_node_parser.parse()
         if stmts_tuple is None:
             return [node]
diff --git a/python/paddle/fluid/dygraph/dygraph_to_static/utils.py b/python/paddle/fluid/dygraph/dygraph_to_static/utils.py
index 0372dab799bfb6fda2e6b1ffe0397d1250522acf..bad09a160d24bc7ca6d0166b8d0820122400b5eb 100644
--- a/python/paddle/fluid/dygraph/dygraph_to_static/utils.py
+++ b/python/paddle/fluid/dygraph/dygraph_to_static/utils.py
@@ -628,7 +628,7 @@ class IsControlFlowVisitor(gast.NodeVisitor):
 
 class NameNodeReplaceTransformer(gast.NodeTransformer):
     """
-    This class transform specfice gast.Name node to replace node
+    This class replaces specified gast.Name node by replace_node.
     """
 
     def __init__(self, root_node, target_name, replace_node):
@@ -644,9 +644,9 @@ class NameNodeReplaceTransformer(gast.NodeTransformer):
         return node
 
 
-class ForNodeParser(object):
+class ForNodeVisitor(object):
     """
-    This class parse python for statement, get transformed 3 statement components of for node
+    This class parses python for statement, get transformed 3 statement components of for node
     three key statements:
         1). init_stmts: list[node], prepare nodes of for loop, may not only one
         2). cond_stmt: node, condition node to judge whether continue loop
@@ -664,7 +664,7 @@ class ForNodeParser(object):
     def __init__(self, for_node):
         assert isinstance(
             for_node, gast.For
-        ), "Input node for the initialization of ForNodeParser is not gast.For node."
+        ), "Input node for the initialization of ForNodeVisitor is not gast.For node."
         # 1. original for node
         self.node = for_node
 
@@ -806,9 +806,7 @@ class ForNodeParser(object):
                     ],
                     value=self.iter_args[0])
         else:
-            # TODO: slice bug, only support int32 index
-            index_init_node = get_constant_variable_node(
-                self.iter_idx_name, 0, dtype='int32')
+            index_init_node = get_constant_variable_node(self.iter_idx_name, 0)
         return index_init_node
 
     def _build_var_shape_assign_node(self):