diff --git a/vllm/platforms/cpu.py b/vllm/platforms/cpu.py
index 179ee6a7d24..a9216c2322e 100644
--- a/vllm/platforms/cpu.py
+++ b/vllm/platforms/cpu.py
@@ -115,6 +115,9 @@ def check_and_update_config(cls, vllm_config: VllmConfig) -> None:
         # Environment variables for CPU executor
         #
 
+        # Set default threads num for OpenMP parallel
+        os.environ["OMP_NUM_THREADS"] = str(torch.get_num_threads())
+
         # Disable torch async compiling which won't work with daemonic processes
         os.environ["TORCHINDUCTOR_COMPILE_THREADS"] = "1"