diff --git a/include/neuron/otel/otel_manager.h b/include/neuron/otel/otel_manager.h
index 25aad8a0..074d6657 100644
--- a/include/neuron/otel/otel_manager.h
+++ b/include/neuron/otel/otel_manager.h
@@ -42,6 +42,8 @@ neu_otel_trace_ctx neu_otel_find_trace2(void *req_ctx);
 void neu_otel_trace_set_final(neu_otel_trace_ctx ctx);
 
 void neu_otel_trace_set_expected_span_num(neu_otel_trace_ctx ctx, uint32_t num);
+void neu_otel_trace_reduce_expected_span_num(neu_otel_trace_ctx ctx,
+                                             uint32_t           num);
 uint8_t *neu_otel_get_trace_id(neu_otel_trace_ctx ctx);
 
 neu_otel_trace_ctx neu_otel_find_trace_by_id(const char *trace_id);
diff --git a/src/adapter/adapter.c b/src/adapter/adapter.c
index d27c43fb..a0a9b9ef 100644
--- a/src/adapter/adapter.c
+++ b/src/adapter/adapter.c
@@ -124,6 +124,13 @@ static void *adapter_consumer(void *arg)
         if (adapter->state == NEU_NODE_RUNNING_STATE_RUNNING) {
             adapter->module->intf_funs->request(
                 adapter->plugin, (neu_reqresp_head_t *) header, &header[1]);
+        } else {
+            if (neu_otel_control_is_started() && header->ctx) {
+                neu_otel_trace_ctx trace = neu_otel_find_trace(header->ctx);
+                if (trace) {
+                    neu_otel_trace_reduce_expected_span_num(trace, 1);
+                }
+            }
         }
 
         neu_trans_data_free((neu_reqresp_trans_data_t *) &header[1]);
diff --git a/src/otel/otel_manager.c b/src/otel/otel_manager.c
index dfff5fd2..4f19b02c 100644
--- a/src/otel/otel_manager.c
+++ b/src/otel/otel_manager.c
@@ -540,6 +540,16 @@ void neu_otel_trace_set_expected_span_num(neu_otel_trace_ctx ctx, uint32_t num)
     trace_ctx->expected_span_num = num;
 }
 
+void neu_otel_trace_reduce_expected_span_num(neu_otel_trace_ctx ctx,
+                                             uint32_t           num)
+{
+    trace_ctx_t *trace_ctx = (trace_ctx_t *) ctx;
+    trace_ctx->expected_span_num -= num;
+    if (trace_ctx->expected_span_num <= 0) {
+        trace_ctx->final = true;
+    }
+}
+
 uint8_t *neu_otel_get_trace_id(neu_otel_trace_ctx ctx)
 {
     trace_ctx_t *trace_ctx = (trace_ctx_t *) ctx;