diff --git a/paddle/framework/block_desc.cc b/paddle/framework/block_desc.cc
index ca3d03e55410c22fb31a8c11eb80e51e969524b0..3e344ea3790f57b0f53f36a40263dcdd326e67a9 100644
--- a/paddle/framework/block_desc.cc
+++ b/paddle/framework/block_desc.cc
@@ -155,8 +155,6 @@ BlockDesc::BlockDesc(ProgramDesc *prog, proto::BlockDesc *desc)
   for (const proto::OpDesc &op_desc : desc_->ops()) {
     ops_.emplace_back(new OpDesc(op_desc, prog, this));
   }
-  std::cout << "Constructed block idx " << desc->idx() << " from protobuf str"
-            << std::endl;
 }
 
 BlockDesc::BlockDesc(const BlockDesc &other, proto::BlockDesc *desc,
@@ -164,9 +162,8 @@ BlockDesc::BlockDesc(const BlockDesc &other, proto::BlockDesc *desc,
     : prog_(prog), desc_(desc) {
   need_update_ = true;
   for (auto &op : other.ops_) {
-    ops_.emplace_back(new OpDesc(*op, this));
+    ops_.emplace_back(new OpDesc(*op->Proto(), prog, this));
   }
-
   for (auto &it : other.vars_) {
     auto *var = new VarDesc(*it.second);
     vars_[it.first].reset(var);
diff --git a/paddle/framework/op_desc.cc b/paddle/framework/op_desc.cc
index 7859c391fa370f1f2e60b8a94f2a370a99c2a765..46c50d9250f318b6afbe3c76c5c15cc5c51d1f2c 100644
--- a/paddle/framework/op_desc.cc
+++ b/paddle/framework/op_desc.cc
@@ -124,21 +124,10 @@ OpDesc::OpDesc(const proto::OpDesc &desc, ProgramDesc *prog, BlockDesc *block)
   // restore attrs_
   for (const proto::OpDesc::Attr &attr : desc_.attrs()) {
     std::string attr_name = attr.name();
-    // we use a trick to handle attr.type() is BLOCK here, because at this
-    // moment the sub_block hasn't beed added to ProgramDesc's vector<Block>
-    // so we cast the block_idx to a dummy BlockDesc pointer
+    // The sub_block referred to by the BLOCK attr hasn't be added
+    // to ProgramDesc class yet, we skip setting BLOCK attr here.
     if (attr.type() != proto::AttrType::BLOCK) {
       attrs_[attr_name] = GetAttrValue(attr);
-    } else {
-      size_t blk_idx = attr.block_idx();
-      if (blk_idx < prog->Size()) {
-        attrs_[attr_name] = prog->MutableBlock(blk_idx);
-        std::cout << "In OpDesc: set up attr block idx " << blk_idx
-                  << std::endl;
-      } else {
-        std::cout << "In OpDesc: We don't have this block idx " << blk_idx
-                  << std::endl;
-      }
     }
   }
   this->block_ = block;
diff --git a/paddle/framework/program_desc.cc b/paddle/framework/program_desc.cc
index ba461b093390ff501caa7c0a39e720f39c66c4e8..0e937dda4e185590648962a6d4f827eea21eb620 100644
--- a/paddle/framework/program_desc.cc
+++ b/paddle/framework/program_desc.cc
@@ -43,7 +43,6 @@ ProgramDesc::ProgramDesc() {
 
 ProgramDesc::ProgramDesc(const ProgramDesc &o) {
   desc_ = o.desc_;
-
   for (int i = 0; i < desc_.blocks_size(); ++i) {
     auto *block = desc_.mutable_blocks(i);
     blocks_.emplace_back(new BlockDesc(*o.blocks_[i], block, this));
@@ -54,8 +53,6 @@ ProgramDesc::ProgramDesc(const ProgramDesc &o) {
         if (attr.type() == proto::AttrType::BLOCK) {
           size_t blk_idx = attr.block_idx();
           op->SetBlockAttr(attr.name(), *this->MutableBlock(blk_idx));
-          std::cout << "In ProgramDesc 1: set block attr idx " << blk_idx
-                    << std::endl;
         }
       }
     }
@@ -64,11 +61,8 @@ ProgramDesc::ProgramDesc(const ProgramDesc &o) {
 
 ProgramDesc::ProgramDesc(const proto::ProgramDesc &desc) {
   desc_ = desc;
-  std::cout << std::endl << "starting in ProgDesc constructor" << std::endl;
   for (auto &block_desc : *desc_.mutable_blocks()) {
     blocks_.emplace_back(new BlockDesc(this, &block_desc));
-    std::cout << "Done constructing block idx " << block_desc.idx()
-              << " parent idx " << block_desc.parent_idx() << std::endl;
   }
   for (auto &block : blocks_) {
     for (auto *op : block->AllOps()) {
@@ -76,13 +70,10 @@ ProgramDesc::ProgramDesc(const proto::ProgramDesc &desc) {
         if (attr.type() == proto::AttrType::BLOCK) {
           size_t blk_idx = attr.block_idx();
           op->SetBlockAttr(attr.name(), *this->MutableBlock(blk_idx));
-          std::cout << "In ProgramDesc 2: set block attr idx " << blk_idx
-                    << std::endl;
         }
       }
     }
   }
-  std::cout << "Done ProgDesc construction" << std::endl << std::endl;
 }
 
 ProgramDesc::ProgramDesc(const std::string &binary_str) {
diff --git a/paddle/framework/prune.cc b/paddle/framework/prune.cc
index 3c3ec87585124589d5ee4ef648d24cc7d10f5f60..00fe551e55e6be6d4e36a6953fa5b23054fca6e4 100644
--- a/paddle/framework/prune.cc
+++ b/paddle/framework/prune.cc
@@ -137,8 +137,6 @@ void prune_impl(const proto::ProgramDesc& input, proto::ProgramDesc* output,
             sub_block_dependent_vars.insert(argu);
           }
         }
-        std::cout << "pruning the next block, the current output_block_id is "
-                  << output_block_id << std::endl;
         // GetSubBlockIndex(*op) is the idx of the sub_block in the input desc
         // output_block_id is the idx of the current block in the output desc
         prune_impl(input, output, GetSubBlockIndex(*op), output_block_id,
@@ -147,8 +145,6 @@ void prune_impl(const proto::ProgramDesc& input, proto::ProgramDesc* output,
     }
   }
 
-  std::cout << "Starting to remove unreferenced variables"
-            << " for block idx " << output_block_id << std::endl;
   // remove the VarDescs in BlockDesc that are not referenced in
   // the pruned OpDescs
   std::unordered_map<std::string, proto::VarDesc> var_map;
@@ -186,9 +182,7 @@ void prune_impl(const proto::ProgramDesc& input, proto::ProgramDesc* output,
 // TODO(fengjiayi): Prune() could be inplaced to avoid unnecessary copies
 void Prune(const proto::ProgramDesc& input, proto::ProgramDesc* output) {
   std::set<std::string> dependent_vars;
-  std::cout << std::endl << "Start C++ framework::prune" << std::endl;
   prune_impl(input, output, 0, -1, dependent_vars);
-  std::cout << "Finished C++ framework::prune" << std::endl << std::endl;
 }
 
 void inference_optimize_impl(const proto::ProgramDesc& input,
diff --git a/python/paddle/v2/fluid/io.py b/python/paddle/v2/fluid/io.py
index e410549f8a5b3ba940b75416b9cdbdc4e75e79fe..613dc20b6ea5533d126a73b7ec47796b3f812db5 100644
--- a/python/paddle/v2/fluid/io.py
+++ b/python/paddle/v2/fluid/io.py
@@ -342,12 +342,6 @@ def save_inference_model(dirname,
     prepend_feed_ops(inference_program, feeded_var_names)
     append_fetch_ops(inference_program, fetch_var_names)
 
-    # save for checking
-    curstr = inference_program.to_string(True)
-    f = open("save_inf_prog_after_feed_fetch.txt", 'w')
-    f.write(curstr)
-    f.close()
-
     model_file_name = dirname + "/__model__"
     with open(model_file_name, "wb") as f:
         f.write(inference_program.desc.serialize_to_string())
diff --git a/python/paddle/v2/fluid/tests/book/test_rnn_encoder_decoder.py b/python/paddle/v2/fluid/tests/book/test_rnn_encoder_decoder.py
index 15f00f95d4020e1ea7f745136f0b250a97273d30..2211637b5b0eb263973f889bd66f18bd647e9fc2 100644
--- a/python/paddle/v2/fluid/tests/book/test_rnn_encoder_decoder.py
+++ b/python/paddle/v2/fluid/tests/book/test_rnn_encoder_decoder.py
@@ -225,18 +225,8 @@ def infer(save_dirname=None):
 
     # Construct feed as a dictionary of {feed_target_name: feed_target_data}
     # and results will contain a list of data corresponding to fetch_targets.
-    print("Print feed fetch target names as follows")
-    print(feed_target_names)
     assert feed_target_names[0] == 'source_sequence'
     assert feed_target_names[1] == 'target_sequence'
-    print([var.name for var in fetch_targets])
-
-    # save for checking
-    curstr = inference_program.to_string(True)
-    f = open("loaded_infer_prog.txt", 'w')
-    f.write(curstr)
-    f.close()
-
     results = exe.run(inference_program,
                       feed={
                           feed_target_names[0]: word_data,