diff --git a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexSupport.java b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexSupport.java
index 9b8e89aa..4b6c5d40 100644
--- a/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexSupport.java
+++ b/doc/doc-server/src/main/java/cn/axzo/nanopart/doc/file/index/IndexSupport.java
@@ -31,7 +31,6 @@ import cn.axzo.nanopart.doc.dao.DocLockDao;
 import cn.axzo.nanopart.doc.dao.IndexNodeDao;
 import cn.axzo.nanopart.doc.entity.IndexNode;
 import cn.axzo.nanopart.doc.entity.domain.Path;
-import cn.axzo.nanopart.doc.file.index.domain.NameUsedException;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
@@ -132,8 +131,7 @@ public class IndexSupport {
 
 	void ensureChildNameNotUsed(IndexNodeParentScope parentScope, IndexNodeType nodeType, String childName) {
 		IndexNode child = indexNodeDao.findValidChildByName(parentScope, nodeType, childName);
-		if (child != null)
-			throw new NameUsedException("名称已被使用");
+		BizAssertions.assertNull(child, "名称已被使用");
 	}
 
 	void lockParentAndReleaseOnCommit(IndexNodeParentScope parentScope) {