diff --git a/src/views/flow/admin/Defs.vue b/src/views/flow/admin/Defs.vue
index 717571d..55b2f31 100644
--- a/src/views/flow/admin/Defs.vue
+++ b/src/views/flow/admin/Defs.vue
@@ -34,7 +34,13 @@ const columns = [
     { title: "序号", type: "index", width: 70, align: "center" },
     { title: "流程", key: "name", minWidth: 180 },
     { title: "编码", key: "code", width: 160 },
-    { title: "应用", key: "appKey", width: 130, align: "center", render: (h: any, p: any) => h("span", p.row.appKey ? (appMap.value[p.row.appKey] || p.row.appKey) : "-") },
+    { title: "应用", key: "appKey", width: 130, align: "center", render: (h: any, p: any) => {
+        // 未归属标记（2026-10-12 appKey 必填化）：存量 NULL 线在此醒目，随编辑/升版本收敛
+        if (!p.row.appKey) {
+            return h(Tag, { color: "warning" }, () => "未归属");
+        }
+        return h("span", appMap.value[p.row.appKey] || p.row.appKey);
+    } },
     { title: "版本", key: "version", width: 70, align: "center" },
     { title: "状态", width: 90, align: "center", render: (h: any, p: any) => {
         const c = p.row.status === 1 ? "green" : p.row.status === 0 ? "orange" : "gray";
@@ -197,12 +203,17 @@ async function onMetaSave() {
         Message.warning("流程名称不能为空");
         return;
     }
+    // 归属应用必填（2026-10-12 拍板）：存量未归属行在此原地补填
+    if (!metaForm.value.appKey) {
+        Message.warning("请选择归属应用（应用需先在 流程管理 > 应用设置 中开启）");
+        return;
+    }
     metaSaving.value = true;
     try {
         await flowApi.defUpdateMeta({
             id: metaForm.value.id,
             name: metaForm.value.name.trim(),
-            appKey: metaForm.value.appKey || undefined,
+            appKey: metaForm.value.appKey,
         }).send();
         Message.success("已更新（版本不变）");
         metaVisible.value = false;
@@ -259,7 +270,7 @@ onMounted(() => {
                         <Input v-model="metaForm.name" placeholder="流程名称" :maxlength="30" />
                     </FormItem>
                     <FormItem label="归属应用">
-                        <Select v-model="metaForm.appKey" clearable filterable placeholder="归属应用，可空">
+                        <Select v-model="metaForm.appKey" filterable placeholder="归属应用（必选）">
                             <Option v-for="o in metaAppOptions" :key="o.value" :value="o.value">{{ o.label }}</Option>
                         </Select>
                     </FormItem>
diff --git a/src/views/flow/admin/def-editor/index.vue b/src/views/flow/admin/def-editor/index.vue
index 476c848..3f322a7 100644
--- a/src/views/flow/admin/def-editor/index.vue
+++ b/src/views/flow/admin/def-editor/index.vue
@@ -369,6 +369,12 @@ async function onSave(): Promise<void> {
         Message.warning("请填写流程编码");
         return;
     }
+    // 归属应用必填（2026-10-12 拍板）：新建必须选；升版本继承源线（baseGuid 载入时已带回），
+    // 源线未归属（存量 NULL）时必须在此补选
+    if (!(appKey.value || "").trim()) {
+        Message.warning("请选择归属应用（应用需先在 流程管理 > 应用设置 中开启）");
+        return;
+    }
     const errors = countErrors(issues.value);
     if (errors.length) {
         Message.error(`校验未通过：${errors[0].text}`);
@@ -487,8 +493,8 @@ onUnmounted(() => window.removeEventListener("beforeunload", onBeforeUnload));
                     />
                 </label>
                 <label>
-                    应用
-                    <Select v-model="appKey" placeholder="归属应用，可空" style="width: 170px" clearable filterable>
+                    应用 <span style="color: #ed4014">*</span>
+                    <Select v-model="appKey" placeholder="归属应用（必选）" style="width: 170px" filterable>
                         <Option v-for="a in appOptions" :key="a.appKey" :value="a.appKey">{{ a.appName }}</Option>
                     </Select>
                 </label>