diff --git a/deps/oblib/src/lib/trace/ob_trace.cpp b/deps/oblib/src/lib/trace/ob_trace.cpp
index 01edf57b7..16499f8e2 100644
--- a/deps/oblib/src/lib/trace/ob_trace.cpp
+++ b/deps/oblib/src/lib/trace/ob_trace.cpp
@@ -413,6 +413,7 @@ ObSpanCtx* ObTrace::begin_span(uint32_t span_type, uint8_t level, bool is_follow
       new_span = freed_span_.remove_last();
       current_span_.add_first(new_span);
       new_span->span_type_ = span_type;
+      new_span->span_id_.high_ = 0;
       new_span->span_id_.low_ = ++seq_;
       new_span->span_id_.high_ = 0;
       new_span->source_span_ = last_active_span_;
diff --git a/deps/oblib/src/lib/trace/ob_trace.h b/deps/oblib/src/lib/trace/ob_trace.h
index 989e4d85d..9b09efbbe 100644
--- a/deps/oblib/src/lib/trace/ob_trace.h
+++ b/deps/oblib/src/lib/trace/ob_trace.h
@@ -28,7 +28,7 @@
 #define FLT_END_SPAN(span)                                      \
 if (OB_NOT_NULL(span)) {                                        \
   OBTRACE->end_span(span);                                      \
-  if (span->span_id_.is_inited() && OBTRACE->is_auto_flush()) { \
+  if (span->is_inited() && OBTRACE->is_auto_flush()) { \
     FLUSH_TRACE();                                              \
   }                                                             \
 }
@@ -126,6 +126,7 @@ public:
 
 struct ObTagCtxBase
 {
+  friend void flush_trace();
   ObTagCtxBase() : next_(nullptr), tag_type_(0) {}
   virtual ~ObTagCtxBase() {}
   virtual int tostring(char* buf, const int64_t buf_len, int64_t& pos)
@@ -146,6 +147,7 @@ struct ObTagCtxBase
     }
     return ret;
   }
+protected:
   ObTagCtxBase* next_;
   uint16_t tag_type_;
 };
@@ -186,6 +188,7 @@ int tag_to_string(char* buf, const int64_t buf_len, int64_t& pos, const T& value
 template <typename T>
 struct ObTagCtx final : public ObTagCtxBase
 {
+  friend struct ObTrace;
   ObTagCtx() {}
   virtual ~ObTagCtx() override {}
   virtual int tostring(char* buf, const int64_t buf_len, int64_t& pos) override
@@ -198,13 +201,18 @@ struct ObTagCtx final : public ObTagCtxBase
     }
     return ret;
   }
+private:
   T data_;
 };
 
 struct ObSpanCtx final : public common::ObDLinkBase<ObSpanCtx>
 {
+  friend struct ObTrace;
+  friend void flush_trace();
+public:
   ObSpanCtx();
-
+  OB_INLINE bool is_inited() const { return span_id_.is_inited(); }
+  UUID get_span_id() const { return span_id_; }
   UUID span_id_;
   ObSpanCtx* source_span_;
   int64_t start_ts_;
@@ -348,7 +356,7 @@ public:
   {
     span_ = OBTRACE->begin_span(span_type, level, false);
 #ifndef NDEBUG
-    if (OB_NOT_NULL(span_) && span_->span_id_.is_inited()) {
+    if (OB_NOT_NULL(span_) && span_->is_inited()) {
       FLT_SET_TAG(span_back_trace, lbt());
     }
 #endif
diff --git a/deps/oblib/unittest/lib/trace/test_trace.cpp b/deps/oblib/unittest/lib/trace/test_trace.cpp
index 8428fc3b0..67c79e245 100644
--- a/deps/oblib/unittest/lib/trace/test_trace.cpp
+++ b/deps/oblib/unittest/lib/trace/test_trace.cpp
@@ -54,7 +54,7 @@ TEST(TestTrace, basic_test)
   FLUSH_TRACE();
   auto t = std::thread([=]() {
     // RPC框架端完成初始化
-    OBTRACE->init(trace_id, proxy->span_id_, (auto_flush << 7) + level);
+    OBTRACE->init(trace_id, proxy->get_span_id(), (auto_flush << 7) + level);
     //
     FLTSpanGuard(ObSql);
     FLT_SET_TAG(sql_id, 123);