diff --git a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
index f005c04eb..3cf6b3628 100755
--- a/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/date/DateUtil.java
@@ -522,7 +522,7 @@ public class DateUtil extends CalendarUtil {
 		if (date instanceof DateTime) {
 			timeZone = ((DateTime) date).getTimeZone();
 		}
-		return format(date, FastDateFormat.getInstance(format));
+		return format(date, FastDateFormat.getInstance(format, timeZone));
 	}
 
 	/**
diff --git a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
index d61eea6c6..3de3f8700 100755
--- a/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/date/DateUtilTest.java
@@ -1188,25 +1188,40 @@ public class DateUtilTest {
 	public void formatSpeedTest(){
 		Date value = new Date();
 		long t0 = System.currentTimeMillis();
-		FastDateFormat.getInstance("YYYY-MM-dd HH:mm:ss.SSSSSS");
+		//此处先加载FastDateFormat对象，保存到FastDateFormat.CACHE中
+		//解决后面两个for循环中保存到FastDateFormat对象创建未时差异的问题。
+		FastDateFormat.getInstance("YYYY-MM-dd HH:mm:ss.SSS");
+
 		long t1 = System.currentTimeMillis();
 		String strTime = null;
-		for(int i=0; i<5000; i++){
-			strTime = DateUtil.format(value, "YYYY-MM-dd HH:mm:ss.SSSSSS");
+		for(int i=0; i<50000; i++){
+			strTime = DateUtil.format(value, "YYYY-MM-dd HH:mm:ss.SSS");
 		}
-		System.out.println("format="+strTime);
 		long t2 = System.currentTimeMillis();
 
-		for(int i=0; i<5000; i++){
-			strTime = FastDateFormat.getInstance("YYYY-MM-dd HH:mm:ss.SSSSSS").format(value);
+		for(int i=0; i<50000; i++){
+			strTime = FastDateFormat.getInstance("YYYY-MM-dd HH:mm:ss.SSS").format(value);
 		}
-		System.out.println("FastDateFormat="+strTime);
-
 		long t3 = System.currentTimeMillis();
 
-		System.out.println("t1-t0="+(t1-t0));
-		System.out.println("t2-t1="+(t2-t1));
-		System.out.println("t3-t2="+(t3-t2));
+		long initTime = t1 - t0;
+		long formtTime1 = t2 - t1;
+		long formatTime2 = t3 - t2;
+
+		//此处仍然不明白，两个for循环实际执行format方法都一样，为什么第1个for时间大致是第2个for的3倍。
+		Assert.assertTrue(formtTime1 > formatTime2);
+/**
+ * 		System.out.println("t1-t0="+(t1-t0));
+ * 		System.out.println("t2-t1="+(t2-t1));
+ * 		System.out.println("t3-t2="+(t3-t2));
+ *
+ * 由日志可以看出，第1个for时间大致是第2个for的3倍
+ *
+ * t1-t0=46
+ * t2-t1=65
+ * t3-t2=25
+ */
+
 	}
 
 }