diff --git a/modules/uhd/uhd_usrp_io/uhd_io.cpp b/modules/uhd/uhd_usrp_io/uhd_io.cpp
index 934fee2acf00674ff34d4c8d650e8417fde5e3c5..434e99a7de13e8de2f45efd4e0cfe30fd0593105 100644
--- a/modules/uhd/uhd_usrp_io/uhd_io.cpp
+++ b/modules/uhd/uhd_usrp_io/uhd_io.cpp
@@ -530,6 +530,7 @@ int do_iio(const cmdlineParser & args)
 									tag_tx_plain * plan = (tag_tx_plain *) (packagedta.data());
 									if (total_points_left==-1)
 										total_points_left = plan->length_left;
+									//fprintf(stderr,"plan %d points\n",plan->length_left);
 									mtx_plan.lock();
 									tx_plan.push_back(*plan);
 									mtx_plan.unlock();
@@ -541,6 +542,7 @@ int do_iio(const cmdlineParser & args)
 							}
 							else
 							{
+								//fprintf(stderr,"recv %d points\n",packagedta.size()/2/sizeof(SPTYPE));
 								for (int ch = 0; ch < tx_channel_count;++ch)
 								{
 									if (header.subject_id == i_wav_tx[ch])
@@ -600,10 +602,11 @@ int do_iio(const cmdlineParser & args)
 							continue;
 						}
 						//突发模式数据不够
-						if (total_points_left >0 &&  tx_pos[ch] + (long long) (tx_sps_buff ) >= stdin_pos[ch]
-								&&  tx_pos[ch] + (long long) (total_points_left ) >= stdin_pos[ch]
+						if (total_points_left >0 &&  tx_pos[ch] + (long long) (tx_sps_buff ) > stdin_pos[ch]
+								&&  tx_pos[ch] + (long long) (total_points_left ) > stdin_pos[ch]
 								)
 						{
+							//fprintf(stderr,"total_points LESS! for %d points\n",total_points_left);
 							can_send = false;
 							continue;
 						}
@@ -641,6 +644,7 @@ int do_iio(const cmdlineParser & args)
 						//First pack
 						if (plan->length_left==total_points_left)
 						{
+							//fprintf(stderr,"total_points start for %d points\n",total_points_left);
 							if (total_points_left <= (qint64)tx_sps_buff)
 							{
 								UHD_DO(uhd_tx_metadata_make(&tx_meta_burst,
@@ -657,11 +661,15 @@ int do_iio(const cmdlineParser & args)
 						//Last pack
 						else if (total_points_left <= (qint64)tx_sps_buff)
 						{
+							//fprintf(stderr,"total_points end for %d points\n",total_points_left);
 							emit_points = total_points_left;
 							UHD_DO(uhd_tx_metadata_make(&tx_meta_burst,false,0,0,false,true));
 						}
 						else
+						{
+							//fprintf(stderr,"total_points middle for %d points\n",total_points_left);
 							UHD_DO(uhd_tx_metadata_make(&tx_meta_burst,false,0,0,false,false));
+						}
 
 						UHD_DO(uhd_tx_streamer_send(tx_streamer,
 													(const void **)tx_buff_ptr.data(),
@@ -673,14 +681,18 @@ int do_iio(const cmdlineParser & args)
 						assert(total_points_left>=0);
 						if(total_points_left==0)
 						{
+							//fprintf(stderr,"total_points over\n");
 							mtx_plan.lock();
 							assert(tx_plan.size());
 							tx_plan.pop_front();
 							if (tx_plan.size())
 								total_points_left = tx_plan.front().length_left;
+							else
+								total_points_left = -1;
 							mtx_plan.unlock();
 						}
 						UHD_DO(uhd_tx_metadata_free(&tx_meta_burst));
+						//fprintf(stderr,"total_points left %d points\n",total_points_left);
 					}//end else if (total_points_left>0)
 
 				}//end while (!stop_signal_called)