diff --git a/be/src/runtime/task_group/task_group.cpp b/be/src/runtime/task_group/task_group.cpp
index 3c5226471585bdf..f8b0c1419c2857d 100644
--- a/be/src/runtime/task_group/task_group.cpp
+++ b/be/src/runtime/task_group/task_group.cpp
@@ -57,9 +57,10 @@ std::string TaskGroup::debug_string() const {
     std::shared_lock<std::shared_mutex> rl {_mutex};
     return fmt::format(
             "TG[id = {}, name = {}, cpu_share = {}, memory_limit = {}, enable_memory_overcommit = "
-            "{}, version = {}, cpu_hard_limit = {}]",
+            "{}, version = {}, cpu_hard_limit = {}, scan_thread_num = {}]",
             _id, _name, cpu_share(), PrettyPrinter::print(_memory_limit, TUnit::BYTES),
-            _enable_memory_overcommit ? "true" : "false", _version, cpu_hard_limit());
+            _enable_memory_overcommit ? "true" : "false", _version, cpu_hard_limit(),
+            _scan_thread_num);
 }
 
 void TaskGroup::check_and_update(const TaskGroupInfo& tg_info) {
@@ -81,6 +82,7 @@ void TaskGroup::check_and_update(const TaskGroupInfo& tg_info) {
             _enable_memory_overcommit = tg_info.enable_memory_overcommit;
             _cpu_share = tg_info.cpu_share;
             _cpu_hard_limit = tg_info.cpu_hard_limit;
+            _scan_thread_num = tg_info.scan_thread_num;
         } else {
             return;
         }
diff --git a/be/src/runtime/task_group/task_group.h b/be/src/runtime/task_group/task_group.h
index 9a6baf49dd8f702..3767731435a6f15 100644
--- a/be/src/runtime/task_group/task_group.h
+++ b/be/src/runtime/task_group/task_group.h
@@ -134,6 +134,7 @@ class TaskGroup : public std::enable_shared_from_this<TaskGroup> {
     std::atomic<uint64_t> _cpu_share;
     std::vector<TgTrackerLimiterGroup> _mem_tracker_limiter_pool;
     std::atomic<int> _cpu_hard_limit;
+    std::atomic<int> _scan_thread_num;
 
     // means task group is mark dropped
     // new query can not submit