diff --git a/bmf/engine/c_engine/include/assemble_module.h b/bmf/engine/c_engine/include/assemble_module.h
index 87b338e..b210876 100644
--- a/bmf/engine/c_engine/include/assemble_module.h
+++ b/bmf/engine/c_engine/include/assemble_module.h
@@ -17,7 +17,6 @@
 
 #include <bmf/sdk/module.h>
 #include <bmf/sdk/module_registry.h>
-#include "safe_queue.h"
 
 USE_BMF_SDK_NS
 class AssembleModule : public Module {
@@ -38,7 +37,7 @@ class AssembleModule : public Module {
 
     int queue_index_;
 
-    std::map<int, std::shared_ptr<bmf_engine::SafeQueue<Packet>>> queue_map_;
+    std::map<int, std::shared_ptr<std::queue<Packet>>> queue_map_;
 };
 
 REGISTER_MODULE_CLASS(AssembleModule)
diff --git a/bmf/engine/c_engine/src/assemble_module.cpp b/bmf/engine/c_engine/src/assemble_module.cpp
index 92b7293..f4b7805 100644
--- a/bmf/engine/c_engine/src/assemble_module.cpp
+++ b/bmf/engine/c_engine/src/assemble_module.cpp
@@ -32,10 +32,10 @@ int AssembleModule::process(Task &task) {
         last_input_num_ = task.get_inputs().size();
         // init queue_map_ 
         for (int i = 0; i < last_input_num_; i++) {
-            std::shared_ptr<bmf_engine::SafeQueue<Packet>> tmp_queue = 
-                std::make_shared<bmf_engine::SafeQueue<Packet>>();
+            std::shared_ptr<std::queue<Packet>> tmp_queue = 
+                std::make_shared<std::queue<Packet>>();
             queue_map_.insert(
-                std::pair<int, std::shared_ptr<bmf_engine::SafeQueue<Packet>>>(
+                std::pair<int, std::shared_ptr<std::queue<Packet>>>(
                     i, tmp_queue));
         }
     }
@@ -71,18 +71,19 @@ int AssembleModule::process(Task &task) {
         if (in_eof_[queue_index_] == true)
             continue;
         
-        if (queue->second->pop(packet)) {
-            task.fill_output_packet(0, packet);
-            if (packet.timestamp() == BMF_EOF) {
-                in_eof_[queue_index_] = true;
-            }
-            BMFLOG_NODE(BMF_DEBUG, node_id_)
-                << "get packet :" << packet.timestamp()
-                << " data:" << packet.type_info().name
-                << " in queue:" << queue_index_;
+        packet = queue->second->front();
+        queue->second->pop();
 
-            queue_index_ = (queue_index_ + 1) % queue_map_.size();
+        task.fill_output_packet(0, packet);
+        if (packet.timestamp() == BMF_EOF) {
+            in_eof_[queue_index_] = true;
         }
+        BMFLOG_NODE(BMF_DEBUG, node_id_)
+            << "get packet :" << packet.timestamp()
+            << " data:" << packet.type_info().name
+            << " in queue:" << queue_index_;
+
+        queue_index_ = (queue_index_ + 1) % queue_map_.size();   
     }
 
     bool all_eof = true;
diff --git a/bmf/engine/c_engine/src/optimizer.cpp b/bmf/engine/c_engine/src/optimizer.cpp
index 16ada4a..a676c6f 100644
--- a/bmf/engine/c_engine/src/optimizer.cpp
+++ b/bmf/engine/c_engine/src/optimizer.cpp
@@ -427,8 +427,8 @@ void process_distributed_node(std::vector<bmf_engine::NodeConfig> &nodes) {
                         node->output_streams[0].get_identifier() &&
                         tem_node.get_id() != assemble_node.get_id()) {
                         tem_node.change_input_stream_identifier((assemble_node.
-                                                                get_output_streams())[0].
-                                                                get_identifier());
+                                                                 get_output_streams())[0].
+                                                                 get_identifier());
                     }
                 }
             }