diff --git a/paddle/pybind/protobuf.cc b/paddle/pybind/protobuf.cc
index b4ed9c4335ab2a293b62fb523d9627046db42f19..0fb78bf7a242e33a39016c66e76535c90dcf0202 100644
--- a/paddle/pybind/protobuf.cc
+++ b/paddle/pybind/protobuf.cc
@@ -59,14 +59,7 @@ public:
   BlockDescBind(ProgramDescBind *prog, BlockDesc *desc)
       : prog_(prog), desc_(desc), need_update_(false) {}
 
-  ~BlockDescBind() {
-    std::cerr << "dtor " << this << "," << desc_ << std::endl;
-  }
-
-  int32_t id() const {
-    std::cerr << "desc ptr " << desc_ << std::endl;
-    return desc_->idx();
-  }
+  int32_t id() const { return desc_->idx(); }
 
   int32_t Parent() const { return desc_->parent_idx(); }
 
@@ -114,11 +107,9 @@ public:
     return *ptr;
   }
 
-  BlockDescBind *AppendBlock(BlockDescBind *parent) {
+  BlockDescBind *AppendBlock(const BlockDescBind &parent) {
     auto *b = prog_->add_blocks();
-    std::cerr << "block ptr " << b << std::endl;
-    std::cerr << "pass ptr " << parent << std::endl;
-    b->set_parent_idx(parent->id());
+    b->set_parent_idx(parent.id());
     b->set_idx(prog_->blocks_size() - 1);
     blocks_.emplace_back(this, b);
     return &blocks_.back();
@@ -141,6 +132,7 @@ public:
 
 private:
   explicit ProgramDescBind(ProgramDesc *prog) : prog_(prog) {
+    blocks_.reserve(100);
     for (auto &block : *prog->mutable_blocks()) {
       blocks_.emplace_back(this, &block);
     }
@@ -181,7 +173,6 @@ void BindProgramDesc(py::module &m) {
 }
 
 void BindBlockDesc(py::module &m) {
-  using namespace paddle::framework;  // NOLINT
   py::class_<BlockDescBind>(m, "BlockDesc", "")
       .def_property_readonly("id", &BlockDescBind::id)
       .def_property_readonly("parent", &BlockDescBind::Parent)
diff --git a/python/paddle/v2/framework/tests/test_protobuf_descs.py b/python/paddle/v2/framework/tests/test_protobuf_descs.py
index b5ff2d4c36be7f7cfd0e3a794d7f50f27618ea21..fbe1f7152bb12dd7ddc69894a9ce2a892784d8f0 100644
--- a/python/paddle/v2/framework/tests/test_protobuf_descs.py
+++ b/python/paddle/v2/framework/tests/test_protobuf_descs.py
@@ -17,16 +17,12 @@ class TestProgramDesc(unittest.TestCase):
         self.assertIsNotNone(prog_desc)
         block_root = prog_desc.block(0)
         self.assertIsNotNone(block_root)
-        print 'here'
         self.assertEqual(block_root.id, 0)
         block1 = prog_desc.append_block(block_root)
         block2 = prog_desc.append_block(block1)
         self.assertIsNotNone(block1)
-        print 'here'
         self.assertEqual(block1.id, block2.parent)
-        print 'here'
         self.assertEqual(block_root.id, block1.parent)
-        print 'here'
         block3 = prog_desc.append_block(block_root)
         self.assertEqual(block3.parent, block_root.id)
         self.assertEqual(prog_desc.block(1).id, 1)