diff --git a/paddle/fluid/framework/ir/graph.cc b/paddle/fluid/framework/ir/graph.cc
index 398f7095968e62f92d610f560d7574b27706d13e..11102bc776c2643946dd98219a3ca9ea6a1928cf 100644
--- a/paddle/fluid/framework/ir/graph.cc
+++ b/paddle/fluid/framework/ir/graph.cc
@@ -24,68 +24,6 @@ namespace paddle {
 namespace framework {
 namespace ir {
 
-std::vector<std::string> FindDistTrainSendVars(
-    const std::vector<ir::Node *> &nodes) {
-  std::vector<std::string> send_vars;
-  // since parameters are all in block 0,
-  // it's enough to only scan send ops in block 0
-  for (auto &node : nodes) {
-    auto op_vars = node->Op()->InputArgumentNames();
-    send_vars.reserve(send_vars.size() +
-                      std::distance(op_vars.begin(), op_vars.end()));
-    send_vars.insert(send_vars.end(), op_vars.begin(), op_vars.end());
-  }
-  return send_vars;
-}
-
-std::vector<std::string> FindDistTrainRecvVars(
-    const std::vector<ir::Node *> &nodes) {
-  std::vector<std::string> recv_vars;
-  for (auto &node : nodes) {
-    auto op_vars = node->Op()->OutputArgumentNames();
-    recv_vars.reserve(recv_vars.size() +
-                      std::distance(op_vars.begin(), op_vars.end()));
-    recv_vars.insert(recv_vars.end(), op_vars.begin(), op_vars.end());
-  }
-  return recv_vars;
-}
-
-bool IsDistTrainOp(ir::Node *node, const std::vector<std::string> &send_vars,
-                   const std::vector<std::string> &recv_vars) {
-  if (send_vars.size() == 0 || recv_vars.size() == 0) {
-    return false;
-  }
-
-  /**
-   * Check any of opvars contains `.block` and in sendvars
-   */
-  auto checker = [](const std::vector<std::string> &opvars,
-                    const std::vector<std::string> &rpc_vars) -> bool {
-    for (auto &var : opvars) {
-      // a variable name with the suffix `.block` means it's a splited
-      // variable by (DistributeTranspiler)
-      // [python/paddle/fluid/transpiler/distribute_transpiler.py]
-      if (var.find(".block") != std::string::npos &&
-          std::find(rpc_vars.begin(), rpc_vars.end(), var) != rpc_vars.end()) {
-        return true;
-      }
-    }
-    return false;
-  };
-
-  std::vector<std::string> input_var_names;
-  std::vector<std::string> output_var_names;
-  for (ir::Node *input : node->inputs) {
-    input_var_names.push_back(input->Name());
-  }
-  for (ir::Node *output : node->outputs) {
-    output_var_names.push_back(output->Name());
-  }
-
-  return checker(output_var_names, send_vars) ||
-         checker(input_var_names, recv_vars);
-}
-
 Graph::Graph(const ProgramDesc &program) : program_(program) {
   // Make the nodes id start from 0.
   Node::ResetId();
diff --git a/paddle/fluid/framework/ir/node.h b/paddle/fluid/framework/ir/node.h
index 5d6da9f1d76a3c0fc64b7ff35264e385cf19a14b..d6d42f5e92080aa57445e2d6ce59aa3faa89d22d 100644
--- a/paddle/fluid/framework/ir/node.h
+++ b/paddle/fluid/framework/ir/node.h
@@ -44,6 +44,7 @@ class Node {
     return op_desc_.get();
   }
 
+  // Please don't use this API!
   int id() const { return id_; }
 
   bool IsOp() const { return type_ == Type::kOperation; }
@@ -92,6 +93,7 @@ class Node {
   Node() = delete;
 
   static int count_;
+  // Please don't use this API or make this public.
   static void ResetId() { count_ = 0; }
   DISABLE_COPY_AND_ASSIGN(Node);
 };
diff --git a/paddle/fluid/framework/op_desc.h b/paddle/fluid/framework/op_desc.h
index 440e0509be727ec2b84abc76fca44edda11f8a0a..30c8a26c3d2f0068674aa70b4ff875a2f73c1dca 100644
--- a/paddle/fluid/framework/op_desc.h
+++ b/paddle/fluid/framework/op_desc.h
@@ -121,10 +121,6 @@ class OpDesc {
 
   BlockDesc *Block() { return this->block_; }
 
-  const BlockDesc &BlockRef() const { return *this->block_; }
-
-  void SetBlock(BlockDesc *block) { this->block_ = block; }
-
  private:
   template <typename MapType>
   static std::vector<typename MapType::key_type> MapKeys(const MapType &map) {