diff --git a/src/components/DataTable/DataTable.vue b/src/components/DataTable/DataTable.vue
index 9c1558e..d32d7ec 100644
--- a/src/components/DataTable/DataTable.vue
+++ b/src/components/DataTable/DataTable.vue
@@ -209,6 +209,16 @@ function onLimitChange(l: number) { emit('limit-change', l) }
   :deep(.el-table__inner-wrapper) {
     border-radius: 10px 10px 0 0;
   }
+  // 表头单元格强制不换行 (兜底, header-cell-style 的 whiteSpace 在某些列宽挤压下失效)
+  :deep(.el-table__header-wrapper .cell),
+  :deep(.el-table__header th .cell) {
+    white-space: nowrap !important;
+    overflow: visible !important;
+  }
+  // 表头内容容器允许溢出不被截断
+  :deep(.el-table th .cell) {
+    word-break: keep-all;
+  }
   // 去掉 el-table 默认的 border
   :deep(.el-table--border) {
     border: none;