diff --git a/hutool-extra/src/main/java/cn/hutool/extra/cglib/BeanCopierCache.java b/hutool-extra/src/main/java/cn/hutool/extra/cglib/BeanCopierCache.java
index 18d381560..1db413a36 100644
--- a/hutool-extra/src/main/java/cn/hutool/extra/cglib/BeanCopierCache.java
+++ b/hutool-extra/src/main/java/cn/hutool/extra/cglib/BeanCopierCache.java
@@ -42,9 +42,10 @@ public enum BeanCopierCache {
 	 * @return 属性名和Map映射的key
 	 */
 	private String genKey(Class<?> srcClass, Class<?> targetClass, Converter converter) {
-		StringBuilder key = new StringBuilder().append(StrUtil.format("{}#{}", srcClass.getName(), targetClass.getName()));
+		final StringBuilder key = StrUtil.builder()
+				.append(srcClass.getName()).append('#').append(targetClass.getName());
 		if(null != converter){
-			key.append("#").append(converter.getClass().getName());
+			key.append('#').append(converter.getClass().getName());
 		}
 		return key.toString();
 	}