diff --git a/include/dsn/tool-api/task.h b/include/dsn/tool-api/task.h
index ada5bb8787..2561fd69e5 100644
--- a/include/dsn/tool-api/task.h
+++ b/include/dsn/tool-api/task.h
@@ -439,6 +439,7 @@ class rpc_request_task : public task
                   spec().name.c_str(),
                   _request->header->from_address.to_string(),
                   _request->header->client.timeout_ms);
+            spec().on_rpc_task_dropped.execute(this);
         }
     }
 
diff --git a/include/dsn/tool-api/task_spec.h b/include/dsn/tool-api/task_spec.h
index 082c81f9b1..25aad3d0ed 100644
--- a/include/dsn/tool-api/task_spec.h
+++ b/include/dsn/tool-api/task_spec.h
@@ -217,6 +217,7 @@ class task_spec : public extensible_object<task_spec, 4>
     join_point<bool, task *, message_ex *, rpc_response_task *>
         on_rpc_call; // return true means continue, otherwise dropped and (optionally) timedout
     join_point<bool, rpc_request_task *> on_rpc_request_enqueue;
+    join_point<void, rpc_request_task *> on_rpc_task_dropped; // rpc task dropped
 
     // RPC_RESPONSE
     join_point<bool, task *, message_ex *> on_rpc_reply;
diff --git a/src/runtime/profiler.cpp b/src/runtime/profiler.cpp
index 11a28ac5f2..5aeaa645d8 100644
--- a/src/runtime/profiler.cpp
+++ b/src/runtime/profiler.cpp
@@ -106,7 +106,12 @@ counter_info *counter_info_ptr[] = {
                      "TIMEOUT(#/s)",
                      "#/s"),
     new counter_info(
-        {"task.inqueue", "tiq"}, TASK_IN_QUEUE, COUNTER_TYPE_NUMBER, "InQueue(#)", "#")};
+        {"task.inqueue", "tiq"}, TASK_IN_QUEUE, COUNTER_TYPE_NUMBER, "InQueue(#)", "#"),
+    new counter_info({"rpc.dropped", "rdit"},
+                     RPC_DROPPED_IF_TIMEOUT,
+                     COUNTER_TYPE_NUMBER,
+                     "RPC.DROPPED(#)",
+                     "#")};
 
 // call normal task
 static void profiler_on_task_create(task *caller, task *callee)
@@ -269,6 +274,15 @@ static void profiler_on_rpc_request_enqueue(rpc_request_task *callee)
     }
 }
 
+static void profile_on_rpc_task_dropped(rpc_request_task *callee)
+{
+    auto code = callee->spec().code;
+    auto ptr = s_spec_profilers[code].ptr[RPC_DROPPED_IF_TIMEOUT].get();
+    if (ptr != nullptr) {
+        ptr->increment();
+    }
+}
+
 static void profiler_on_rpc_create_response(message_ex *req, message_ex *resp)
 {
     message_ext_for_profiler::get(resp) = message_ext_for_profiler::get(req);
@@ -461,6 +475,17 @@ void profiler::install(service_spec &)
                     COUNTER_TYPE_NUMBER_PERCENTILES,
                     "");
             }
+            if (dsn_config_get_value_bool(
+                    section_name.c_str(),
+                    "rpc_request_dropped_before_execution_when_timeout",
+                    false,
+                    "whether to profile the number of rpc dropped for timeout"))
+                s_spec_profilers[i].ptr[RPC_DROPPED_IF_TIMEOUT].init_global_counter(
+                    "zion",
+                    "profiler",
+                    (name + std::string(".rpc.dropped")).c_str(),
+                    COUNTER_TYPE_NUMBER,
+                    "rpc dropped if queue time exceed client timeout");
         } else if (spec->type == dsn_task_type_t::TASK_TYPE_RPC_RESPONSE) {
             if (dsn_config_get_value_bool(section_name.c_str(),
                                           "profiler::latency.client",
@@ -519,6 +544,7 @@ void profiler::install(service_spec &)
         spec->on_aio_enqueue.put_back(profiler_on_aio_enqueue, "profiler");
         spec->on_rpc_call.put_back(profiler_on_rpc_call, "profiler");
         spec->on_rpc_request_enqueue.put_back(profiler_on_rpc_request_enqueue, "profiler");
+        spec->on_rpc_task_dropped.put_back(profile_on_rpc_task_dropped, "profiler");
         spec->on_rpc_create_response.put_back(profiler_on_rpc_create_response, "profiler");
         spec->on_rpc_reply.put_back(profiler_on_rpc_reply, "profiler");
         spec->on_rpc_response_enqueue.put_back(profiler_on_rpc_response_enqueue, "profiler");
diff --git a/src/runtime/profiler_header.h b/src/runtime/profiler_header.h
index 8b594fe9b9..9db6148db2 100644
--- a/src/runtime/profiler_header.h
+++ b/src/runtime/profiler_header.h
@@ -44,6 +44,7 @@ enum perf_counter_ptr_type
     RPC_CLIENT_NON_TIMEOUT_LATENCY_NS,
     RPC_CLIENT_TIMEOUT_THROUGHPUT,
     TASK_IN_QUEUE,
+    RPC_DROPPED_IF_TIMEOUT,
 
     PERF_COUNTER_COUNT,
     PERF_COUNTER_INVALID
diff --git a/src/runtime/task/task_spec.cpp b/src/runtime/task/task_spec.cpp
index 79143a313a..af10e3e16c 100644
--- a/src/runtime/task/task_spec.cpp
+++ b/src/runtime/task/task_spec.cpp
@@ -162,6 +162,7 @@ task_spec::task_spec(int code,
 
       on_rpc_call((std::string(name) + std::string(".rpc.call")).c_str()),
       on_rpc_request_enqueue((std::string(name) + std::string(".rpc.request.enqueue")).c_str()),
+      on_rpc_task_dropped((std::string(name) + std::string(".dropped")).c_str()),
       on_rpc_reply((std::string(name) + std::string(".rpc.reply")).c_str()),
       on_rpc_response_enqueue((std::string(name) + std::string(".rpc.response.enqueue")).c_str()),
       on_rpc_create_response((std::string(name) + std::string("rpc.create.response")).c_str())