diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7f31e628..58a5de0e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,10 +3,11 @@
 
 -------------------------------------------------------------------------------------------------------------
 
-# 5.6.3 (2021-03-30)
+# 5.6.3 (2021-03-31)
 
 ### 新特性
 * 【core   】     修改数字转换的实现，增加按照指定端序转换（pr#1492@Github）
+* 【core   】     修改拆分byte数组时最后一组长度的规则（pr#1494@Github）
 ### Bug修复
 
 -------------------------------------------------------------------------------------------------------------
diff --git a/hutool-core/src/main/java/cn/hutool/core/util/PrimitiveArrayUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/PrimitiveArrayUtil.java
index c7ac79523..f554679ac 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/PrimitiveArrayUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/PrimitiveArrayUtil.java
@@ -528,14 +528,15 @@ public class PrimitiveArrayUtil {
 	 */
 	public static byte[][] split(byte[] array, int len) {
 		int amount = array.length / len;
-		int remainder = array.length % len;
+		final int remainder = array.length % len;
 		if (remainder != 0) {
 			++amount;
 		}
-		byte[][] arrays = new byte[amount][];
+		final byte[][] arrays = new byte[amount][];
 		byte[] arr;
 		for (int i = 0; i < amount; i++) {
 			if (i == amount - 1 && remainder != 0) {
+				// 有剩余，按照实际长度创建
 				arr = new byte[remainder];
 				System.arraycopy(array, i * len, arr, 0, remainder);
 			} else {