diff --git a/src/sql/dtl/ob_dtl_channel_loop.cpp b/src/sql/dtl/ob_dtl_channel_loop.cpp
index aa5731f03..2beb7a24b 100644
--- a/src/sql/dtl/ob_dtl_channel_loop.cpp
+++ b/src/sql/dtl/ob_dtl_channel_loop.cpp
@@ -373,12 +373,7 @@ int ObDtlChannelLoop::process_channels(ObIDltChannelLoopPred *pred, int64_t &nth
       LOG_WARN("unexpect next idx", K(next_idx_), K(chan_cnt), K(ret));
     } else {
       chan = chans_[next_idx_];
-      if (OB_UNLIKELY(ObPxCheckAlive::is_in_blacklist(chan->get_peer(), get_process_query_time()))) {
-        ret = OB_RPC_CONNECT_ERROR;
-        LOG_WARN("peer no in communication, maybe crashed", K(ret), K(chan->get_peer()),
-                  K(static_cast<int64_t>(GCONF.cluster_id)));
-        break;
-      } else if (nullptr == pred || pred->pred_process(next_idx_, chan)) {
+      if (nullptr == pred || pred->pred_process(next_idx_, chan)) {
         if (OB_SUCC(chan->process1(&process_func_, 0, last_row_in_buffer))) {
           nth_channel = next_idx_;
           first_data_get_ = true;
diff --git a/src/sql/dtl/ob_dtl_channel_loop.h b/src/sql/dtl/ob_dtl_channel_loop.h
index 49f9ba1c1..3f53dec0e 100644
--- a/src/sql/dtl/ob_dtl_channel_loop.h
+++ b/src/sql/dtl/ob_dtl_channel_loop.h
@@ -123,7 +123,7 @@ public:
   void set_interm_result(bool flag) { use_interm_result_ = flag; }
 private:
   static const int64_t INTERRUPT_CHECK_TIMES = 16;
-  static const int64_t SERVER_ALIVE_CHECK_TIMES = 256;
+  static const int64_t SERVER_ALIVE_CHECK_TIMES = 4096;
   Proc *proc_map_[MAX_PROCS];
   InterruptProc *interrupt_proc_;
   common::ObSEArray<ObDtlChannel*, 128> chans_;