diff --git a/core/src/scheduler/SchedInst.cpp b/core/src/scheduler/SchedInst.cpp
index 8d58b831bff4cf45138222654c02c95b20f660ba..f0c00c2d2ae5216ce2ea37fb53dd2c2eaab104c4 100644
--- a/core/src/scheduler/SchedInst.cpp
+++ b/core/src/scheduler/SchedInst.cpp
@@ -55,8 +55,8 @@ load_simple_config() {
     // get resources
     auto gpu_ids = get_gpu_pool();
 
-    int32_t build_gpu_id;
-    config.GetResourceConfigIndexBuildDevice(build_gpu_id);
+    int32_t index_build_device_id;
+    config.GetResourceConfigIndexBuildDevice(index_build_device_id);
 
     // create and connect
     ResMgrInst::GetInstance()->Add(ResourceFactory::Create("disk", "DISK", 0, true, false));
@@ -70,15 +70,15 @@ load_simple_config() {
     for (auto& gpu_id : gpu_ids) {
         ResMgrInst::GetInstance()->Add(ResourceFactory::Create(std::to_string(gpu_id), "GPU", gpu_id, true, true));
         ResMgrInst::GetInstance()->Connect("cpu", std::to_string(gpu_id), pcie);
-        if (build_gpu_id == gpu_id) {
+        if (index_build_device_id == gpu_id) {
             find_build_gpu_id = true;
         }
     }
 
-    if (not find_build_gpu_id && build_gpu_id != server::CPU_DEVICE_ID) {
+    if (not find_build_gpu_id && index_build_device_id != server::CPU_DEVICE_ID) {
         ResMgrInst::GetInstance()->Add(
-            ResourceFactory::Create(std::to_string(build_gpu_id), "GPU", build_gpu_id, true, true));
-        ResMgrInst::GetInstance()->Connect("cpu", std::to_string(build_gpu_id), pcie);
+            ResourceFactory::Create(std::to_string(index_build_device_id), "GPU", index_build_device_id, true, true));
+        ResMgrInst::GetInstance()->Connect("cpu", std::to_string(index_build_device_id), pcie);
     }
 }
 
diff --git a/core/src/scheduler/optimizer/OnlyGPUPass.cpp b/core/src/scheduler/optimizer/OnlyGPUPass.cpp
index a49b75b17e13cf1e2749d90b1e48f12a9ad8a22c..e5d3c71fd36e066419c37f8d271e2d2eeace8a76 100644
--- a/core/src/scheduler/optimizer/OnlyGPUPass.cpp
+++ b/core/src/scheduler/optimizer/OnlyGPUPass.cpp
@@ -46,8 +46,7 @@ OnlyGPUPass::Run(const TaskPtr& task) {
     auto label = std::make_shared<SpecResLabel>(std::weak_ptr<Resource>(res_ptr));
     task->label() = label;
 
-    ++specified_gpu_id_;
-    specified_gpu_id_ = specified_gpu_id_ % gpu_id.size();
+    specified_gpu_id_ = (specified_gpu_id_ + 1) % gpu_id.size();
     return true;
 }