diff --git a/nflg-qms-admin/src/main/java/com/nflg/qms/admin/service/QmsQcMaterialControllerService.java b/nflg-qms-admin/src/main/java/com/nflg/qms/admin/service/QmsQcMaterialControllerService.java
index 6afc5152..59614215 100644
--- a/nflg-qms-admin/src/main/java/com/nflg/qms/admin/service/QmsQcMaterialControllerService.java
+++ b/nflg-qms-admin/src/main/java/com/nflg/qms/admin/service/QmsQcMaterialControllerService.java
@@ -113,13 +113,14 @@ public class QmsQcMaterialControllerService {
         // 构建当前节点完整路径：parentTree.id（若 parentTree 为空则直接取 id）
         String fullPath = StrUtil.isBlank(category.getParentTree())
                 ? String.valueOf(category.getId())
-                : category.getParentTree() + "." + category.getId();
+                : category.getParentTree();
 
         // 一次查询：自身 + 直接子节点（parentTree=fullPath）+ 孙级及更深（parentTree LIKE 'fullPath.%'）
+        // parent_tree 为 ltree 类型，需显式转为 text 才能与 varchar 比较
         return qcMaterialCategoryService.lambdaQuery()
                 .eq(QmsQcMaterialCategory::getCategoryCode, categoryCode)
-                .or().eq(QmsQcMaterialCategory::getParentTree, fullPath)
-                .or().likeRight(QmsQcMaterialCategory::getParentTree, fullPath + ".")
+                .or().apply("parent_tree::text = {0}", fullPath)
+                .or().apply("parent_tree::text LIKE {0}", fullPath + ".%")
                 .list()
                 .stream()
                 .map(QmsQcMaterialCategory::getCategoryCode)