diff --git a/snail-job-client/snail-job-client-job-core/src/main/java/com/aizuda/snailjob/client/job/core/cache/ThreadPoolCache.java b/snail-job-client/snail-job-client-job-core/src/main/java/com/aizuda/snailjob/client/job/core/cache/ThreadPoolCache.java
index e22d96512..3a5d4a3c1 100644
--- a/snail-job-client/snail-job-client-job-core/src/main/java/com/aizuda/snailjob/client/job/core/cache/ThreadPoolCache.java
+++ b/snail-job-client/snail-job-client-job-core/src/main/java/com/aizuda/snailjob/client/job/core/cache/ThreadPoolCache.java
@@ -24,13 +24,16 @@ public class ThreadPoolCache {
 
     public static ThreadPoolExecutor createThreadPool(Long taskBatchId, int parallelNum) {
         if (CACHE_THREAD_POOL.containsKey(taskBatchId)) {
-            return CACHE_THREAD_POOL.get(taskBatchId);
+            ThreadPoolExecutor threadPoolExecutor = CACHE_THREAD_POOL.get(taskBatchId);
+            threadPoolExecutor.setCorePoolSize(parallelNum);
+            threadPoolExecutor.setMaximumPoolSize(parallelNum);
+            return threadPoolExecutor;
         }
 
         Supplier<ThreadPoolExecutor> supplier = () -> {
 
             ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(
-                    parallelNum, parallelNum, 10, TimeUnit.SECONDS, new LinkedBlockingQueue<>(),
+                    1, 1, 10, TimeUnit.SECONDS, new LinkedBlockingQueue<>(),
                     new CustomizableThreadFactory(MessageFormat.format("snail-job-job-{0}-", taskBatchId)));
             threadPoolExecutor.allowCoreThreadTimeOut(true);
             return threadPoolExecutor;