diff --git a/DSView/pv/data/decoderstack.cpp b/DSView/pv/data/decoderstack.cpp
index b9d82653..59cbb434 100755
--- a/DSView/pv/data/decoderstack.cpp
+++ b/DSView/pv/data/decoderstack.cpp
@@ -444,7 +444,7 @@ void DecoderStack::do_decode_work()
     if (_samplerate == 0.0)
         return;
      
-    decode_proc();   
+    execute_decode_stack();   
 }
 
 uint64_t DecoderStack::get_max_sample_count()
@@ -552,7 +552,7 @@ void DecoderStack::decode_data(const uint64_t decode_start, const uint64_t decod
         decode_done();
 }
 
-void DecoderStack::decode_proc()
+void DecoderStack::execute_decode_stack()
 {  
 	srd_session *session;
 	srd_decoder_inst *prev_di = NULL;
@@ -562,6 +562,8 @@ void DecoderStack::decode_proc()
 	assert(_snapshot);
 
 	// Create the session
+    // one decoderstatck onwer one session
+    // all decoderstatck execute in sequence
 	srd_session_new(&session);
 
 	assert(session);
diff --git a/DSView/pv/data/decoderstack.h b/DSView/pv/data/decoderstack.h
index a1465ac2..30798170 100755
--- a/DSView/pv/data/decoderstack.h
+++ b/DSView/pv/data/decoderstack.h
@@ -155,7 +155,7 @@ public:
 
 private:
     void decode_data(const uint64_t decode_start, const uint64_t decode_end, srd_session *const session);
-	void decode_proc();
+	void execute_decode_stack();
 	static void annotation_callback(srd_proto_data *pdata, void *decoder);
     void do_decode_work();
   
diff --git a/DSView/pv/dock/protocoldock.cpp b/DSView/pv/dock/protocoldock.cpp
index 63bffefb..e89c29a3 100755
--- a/DSView/pv/dock/protocoldock.cpp
+++ b/DSView/pv/dock/protocoldock.cpp
@@ -113,7 +113,7 @@ ProtocolDock::ProtocolDock(QWidget *parent, view::View &view, SigSession *sessio
     _protocol_combobox->setCompleter(NULL);
 
     GSList *l = g_slist_sort(g_slist_copy((GSList*)srd_decoder_list()), decoder_name_cmp);
-    int protocol_index = 0;
+
     std::map<std::string, int> pro_key_table;
     QString repeatNammes;
 
@@ -127,9 +127,8 @@ ProtocolDock::ProtocolDock(QWidget *parent, view::View &view, SigSession *sessio
             DecoderInfoItem *info = new DecoderInfoItem();
             strncpy(info->Name, d->name, DECODER_NAME_LEN-1);
             strncpy(info->Id, d->id, DECODER_NAME_LEN-1);
-            info->Index = protocol_index;
-            info->ObjectHandle = l->data;
-            protocol_index++;
+          
+            info->ObjectHandle = l->data;           
 
             _decoderInfoList.push_back(info);  
 
@@ -145,11 +144,14 @@ ProtocolDock::ProtocolDock(QWidget *parent, view::View &view, SigSession *sessio
         }
     }
     g_slist_free(l);
-
+ 
     //sort protocol list
     sort(_decoderInfoList.begin(), _decoderInfoList.end(), ProtocolDock::protocol_sort_callback);
 
+    int protocol_index = 0;
     for (auto info : _decoderInfoList){
+         info->Index = protocol_index;
+         protocol_index++;
          _protocol_combobox->addItem(QString::fromUtf8(info->Name), QVariant::fromValue(info->Index));
     }
     _protocol_combobox->setCurrentIndex(-1);