diff --git a/be/src/service/internal_service.cpp b/be/src/service/internal_service.cpp
index ff29a7de2dad80..8665fd310675e8 100644
--- a/be/src/service/internal_service.cpp
+++ b/be/src/service/internal_service.cpp
@@ -227,7 +227,7 @@ PInternalServiceImpl::PInternalServiceImpl(ExecEnv* exec_env)
                            "brpc_light"),
           _arrow_flight_work_pool(config::brpc_arrow_flight_work_pool_threads != -1
                                           ? config::brpc_arrow_flight_work_pool_threads
-                                          : std::max(512, CpuInfo::num_cores() * 16),
+                                          : std::max(512, CpuInfo::num_cores() * 2),
                                   config::brpc_arrow_flight_work_pool_max_queue_size != -1
                                           ? config::brpc_arrow_flight_work_pool_max_queue_size
                                           : std::max(20480, CpuInfo::num_cores() * 640),
diff --git a/be/src/vec/spill/spill_stream_manager.cpp b/be/src/vec/spill/spill_stream_manager.cpp
index 12a1e59037fe0d..9925b44e8899bd 100644
--- a/be/src/vec/spill/spill_stream_manager.cpp
+++ b/be/src/vec/spill/spill_stream_manager.cpp
@@ -81,8 +81,9 @@ Status SpillStreamManager::init() {
         }
         store->update_spill_data_usage(spill_data_size);
     }
+    // Reduce min threads to 1, to avoid occupy too many threads at start time.
     static_cast<void>(ThreadPoolBuilder("SpillIOThreadPool")
-                              .set_min_threads(config::spill_io_thread_pool_thread_num)
+                              .set_min_threads(1)
                               .set_max_threads(config::spill_io_thread_pool_thread_num)
                               .set_max_queue_size(config::spill_io_thread_pool_queue_size)
                               .build(&_spill_io_thread_pool));