diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/math/NumberUtilTest.java
similarity index 99%
rename from hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java
rename to hutool-core/src/test/java/org/dromara/hutool/core/math/NumberUtilTest.java
index ef6b26418..40b645be2 100644
--- a/hutool-core/src/test/java/org/dromara/hutool/core/util/NumberUtilTest.java
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/math/NumberUtilTest.java
@@ -10,7 +10,7 @@
  * See the Mulan PSL v2 for more details.
  */
 
-package org.dromara.hutool.core.util;
+package org.dromara.hutool.core.math;
 
 import org.dromara.hutool.core.lang.Console;
 import org.dromara.hutool.core.math.NumberUtil;
diff --git a/hutool-poi/src/main/java/org/dromara/hutool/poi/excel/ExcelBase.java b/hutool-poi/src/main/java/org/dromara/hutool/poi/excel/ExcelBase.java
index 9cc949cf0..efcea6f87 100644
--- a/hutool-poi/src/main/java/org/dromara/hutool/poi/excel/ExcelBase.java
+++ b/hutool-poi/src/main/java/org/dromara/hutool/poi/excel/ExcelBase.java
@@ -212,7 +212,8 @@ public class ExcelBase<T extends ExcelBase<T>> implements Closeable {
 			sheet = workbook.cloneSheet(sheetIndex, newSheetName);
 		} else {
 			sheet = this.workbook.cloneSheet(sheetIndex);
-			this.workbook.setSheetName(sheetIndex, newSheetName);
+			// issue#I8QIBB，clone后的sheet的index应该重新获取
+			this.workbook.setSheetName(workbook.getSheetIndex(sheet), newSheetName);
 		}
 		if (setAsCurrentSheet) {
 			this.sheet = sheet;