diff --git a/mindspore/ccsrc/backend/kernel_compiler/gpu/arrays/topk_gpu_kernel.h b/mindspore/ccsrc/backend/kernel_compiler/gpu/arrays/topk_gpu_kernel.h
index 4b6d8021c5d..b07a37f621d 100644
--- a/mindspore/ccsrc/backend/kernel_compiler/gpu/arrays/topk_gpu_kernel.h
+++ b/mindspore/ccsrc/backend/kernel_compiler/gpu/arrays/topk_gpu_kernel.h
@@ -41,7 +41,13 @@ class TopKGpuKernel : public GpuKernel {
     S *k = GetDeviceAddress<S>(inputs, 1);
     T *output_addr = GetDeviceAddress<T>(outputs, 0);
     S *indices = GetDeviceAddress<S>(outputs, 1);
-    const T init_k = std::numeric_limits<T>::lowest();
+
+    T init_k = std::numeric_limits<T>::lowest();
+    if (std::is_same<T, half>::value) {
+      // min value representable by float16, std::numeric_limits doesn't support half
+      init_k = static_cast<half>(-65504.);
+    }
+
     S k_cut = 0;
     CHECK_CUDA_RET_WITH_EXCEPT(
       kernel_node_,