diff --git a/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.cc b/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.cc
index 6e22fedf1c39428528c00cce4c9a4460dfb95cb3..4ec1accd2e6a9c5a1ca45bc7e66445837af2f46e 100644
--- a/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.cc
+++ b/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.cc
@@ -29,8 +29,8 @@ FastThreadedSSAGraphExecutor::FastThreadedSSAGraphExecutor(
       local_scopes_(local_scopes),
       places_(places),
       graph_(std::move(graph)),
-      pool_(strategy.num_threads_ +
-            1),  // add one more thread for generate op_deps
+      pool_(strategy.num_threads_),
+      prepare_pool_(1),  // add one more thread for generate op_deps
       fetch_ctxs_(places) {
   auto &ops = graph_->Get<details::GraphOps>("ops");
 
@@ -155,9 +155,8 @@ void FastThreadedSSAGraphExecutor::RunOpAsync(
   });
 }
 void FastThreadedSSAGraphExecutor::PrepareAtomicOpDeps() {
-  atomic_op_deps_ = pool_.enqueue([&] {
-    std::unordered_map<OpHandleBase *, std::atomic<int>> *op_deps =
-        new std::unordered_map<OpHandleBase *, std::atomic<int>>;
+  atomic_op_deps_ = prepare_pool_.enqueue([&] {
+    auto *op_deps = new std::unordered_map<OpHandleBase *, std::atomic<int>>;
     for (auto &pair : op_deps_) {
       (*op_deps)[pair.first] = pair.second;
     }
diff --git a/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.h b/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.h
index dad3a231cba6402f57ba654a9ac5fb520b9c8f04..043f9d3fb7849591696c78708d3090be87920e96 100644
--- a/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.h
+++ b/paddle/fluid/framework/details/fast_threaded_ssa_graph_executor.h
@@ -46,6 +46,7 @@ class FastThreadedSSAGraphExecutor : public SSAGraphExecutor {
   std::vector<OpHandleBase *> bootstrap_ops_;
 
   ::ThreadPool pool_;
+  ::ThreadPool prepare_pool_;
   platform::DeviceContextPool fetch_ctxs_;
   std::atomic<int> remaining_;