diff --git a/frontend/src/constants/task.ts b/frontend/src/constants/task.ts
index ce28da1..c778a04 100644
--- a/frontend/src/constants/task.ts
+++ b/frontend/src/constants/task.ts
@@ -4,7 +4,7 @@
  * 供 TaskTreeViewer / TaskListCard / ProductCard 等组件共用，
  * 避免在多处重复维护相同的映射逻辑。
  */
-import { TASK_STATUS } from "../types/api";
+import { TASK_STATUS, type LifecyclePhase } from "../types/api";
 
 export interface StatusStyle {
   bg: string;
@@ -112,6 +112,19 @@ export const STATUS_CONFIG: Record<string, StatusStyle> = {
     ring: "ring-blue-400",
     label: "维修",
   },
+  // ---- 售后回流阶段专属工序（红系，与生产阶段一眼区分）----
+  发货测试: {
+    bg: "bg-red-50",
+    text: "text-red-700",
+    ring: "ring-red-400",
+    label: "发货测试",
+  },
+  售后维修: {
+    bg: "bg-red-50",
+    text: "text-red-700",
+    ring: "ring-red-400",
+    label: "售后维修",
+  },
 };
 
 const FALLBACK: StatusStyle = {
@@ -137,3 +150,100 @@ export function statusColor(status: string): string {
 export function statusLabel(status: string): string {
   return getStatusConfig(status).label;
 }
+
+// ============================================================
+// 🔧 生命周期阶段（lifecycle_phase）与工序选项隔离
+//
+// 生产制造（PRODUCTION）与售后回流（AFTER_SALES）各有一套合法工序名。
+// ⚠️ 本段与后端 app/core/lifecycle.py 是同一份口径，改动请两边同步。
+//
+// 售后阶段使用**独立工序名**（发货测试 / 售后维修），不复用生产阶段的
+// 「测试 / 维修」—— 这样看板、下钻、导出无需 JOIN lifecycle_phase 即可区分。
+// ============================================================
+
+export const LIFECYCLE_PHASE = {
+  PRODUCTION: "PRODUCTION",
+  AFTER_SALES: "AFTER_SALES",
+} as const satisfies Record<string, LifecyclePhase>;
+
+/** 售后专属工序名 — 选中即代表设备进入售后生命周期 */
+export const STEP_SHIP_TEST = "发货测试";
+export const STEP_AFTER_SALES_REPAIR = "售后维修";
+
+const AFTER_SALES_ONLY_STEPS = [STEP_SHIP_TEST, STEP_AFTER_SALES_REPAIR];
+
+// ── 生产制造阶段合法工序（原有词表，一字未改）──
+export const PRODUCTION_TASK_OPTIONS = ["备货", "生产", "测试", "维修", "在库"];
+export const PRODUCTION_OVERALL_OPTIONS = [
+  "备货", "生产", "测试", "维修", "在库", "已入库", "已出库",
+];
+
+// ── 售后回流阶段合法工序：只保留「发货测试 / 售后维修 / 入库出库」──
+export const AFTER_SALES_TASK_OPTIONS = [STEP_SHIP_TEST, STEP_AFTER_SALES_REPAIR, "在库"];
+export const AFTER_SALES_OVERALL_OPTIONS = [
+  STEP_SHIP_TEST, STEP_AFTER_SALES_REPAIR, "在库", "已入库", "已出库",
+];
+
+/**
+ * 按生命周期阶段取「可选工序」——选项隔离的 UI 侧实现。
+ *
+ * hasHistory = false（无任何历史任务的首次激活 / 老设备）时返回**并集**，
+ * 让操作员自行声明这是生产设备还是售后回流设备：一旦选中售后专属工序，
+ * 后端即把设备判为 AFTER_SALES，之后下拉就只剩售后选项。
+ *
+ * 注意：这只是体验层的第一道防线，真正的拦截在后端
+ * task_service._enforce_step_isolation（防伪造传参）。
+ */
+export function taskOptionsFor(
+  phase: string | null | undefined,
+  hasHistory = true,
+): string[] {
+  if (phase === LIFECYCLE_PHASE.AFTER_SALES) return AFTER_SALES_TASK_OPTIONS;
+  if (!hasHistory) return [...PRODUCTION_TASK_OPTIONS, ...AFTER_SALES_ONLY_STEPS];
+  return PRODUCTION_TASK_OPTIONS;
+}
+
+/** 按生命周期阶段取「可选宏观状态」— 同上，含已入库/已出库等终态 */
+export function overallOptionsFor(
+  phase: string | null | undefined,
+  hasHistory = true,
+): string[] {
+  if (phase === LIFECYCLE_PHASE.AFTER_SALES) return AFTER_SALES_OVERALL_OPTIONS;
+  if (!hasHistory) return [...PRODUCTION_OVERALL_OPTIONS, ...AFTER_SALES_ONLY_STEPS];
+  return PRODUCTION_OVERALL_OPTIONS;
+}
+
+/** 列表筛选枚举 — 两阶段并集（用于筛选，不是录入项） */
+export const ALL_OVERALL_OPTIONS = [
+  ...PRODUCTION_OVERALL_OPTIONS, ...AFTER_SALES_ONLY_STEPS,
+];
+
+/** 售后服务相关环节 — 只有落到这些工序才打红色标签 */
+const AFTER_SALES_TAG_STEPS = new Set<string>(AFTER_SALES_ONLY_STEPS);
+
+export interface LifecycleBadge {
+  label: string;
+  className: string;
+  phase: LifecyclePhase;
+}
+
+/**
+ * 生命周期标签 — 只在设备确实处于**售后回流环节**时返回：
+ *   生命周期为 AFTER_SALES 且当前工序是「发货测试」或「售后维修」
+ *    → 红底白字，文案即工序名。
+ *
+ * 生产制造阶段一律返回 null（不打标），避免和售后设备混淆。
+ */
+export function lifecycleBadge(
+  overallStatus: string | null | undefined,
+  phase: string | null | undefined,
+): LifecycleBadge | null {
+  if (phase !== LIFECYCLE_PHASE.AFTER_SALES) return null;
+  const step = (overallStatus || "").trim();
+  if (!AFTER_SALES_TAG_STEPS.has(step)) return null;
+  return {
+    label: step,
+    className: "bg-red-600 text-white ring-1 ring-red-600",
+    phase: LIFECYCLE_PHASE.AFTER_SALES,
+  };
+}
diff --git a/frontend/src/services/dashboardApi.ts b/frontend/src/services/dashboardApi.ts
index b05ec76..0374467 100644
--- a/frontend/src/services/dashboardApi.ts
+++ b/frontend/src/services/dashboardApi.ts
@@ -1,4 +1,5 @@
 import api from "./api";
+import type { LifecyclePhase } from "../types/api";
 
 export interface DashboardStats {
   products_total: number;
@@ -86,6 +87,8 @@ export interface WipMatrixDetailRow {
   material_name: string;
   spec_model: string;
   task_status: string;
+  /** 🔧 生命周期阶段：PRODUCTION(生产制造/发货测试) | AFTER_SALES(出库后返厂售后维修) */
+  lifecycle_phase?: LifecyclePhase;
   assignee_id: string;
   assignee: string;
   duration_hours: number;
diff --git a/frontend/src/types/admin.ts b/frontend/src/types/admin.ts
index 223a269..9767d56 100644
--- a/frontend/src/types/admin.ts
+++ b/frontend/src/types/admin.ts
@@ -1,4 +1,5 @@
 /** 管理端 API 响应类型 */
+import type { LifecyclePhase } from "./api";
 
 export interface ProductResponse {
   id: string;
@@ -17,6 +18,8 @@ export interface ProductResponse {
   macro_status: string | null;
   overall_status: string | null;
   status: string;
+  /** 🔧 生命周期阶段：PRODUCTION(生产制造/发货测试) | AFTER_SALES(出库后返厂售后维修) */
+  lifecycle_phase?: LifecyclePhase;
   created_at: string;
   latest_record_time: string | null;
   latest_record_content: string | null;
diff --git a/frontend/src/types/api.ts b/frontend/src/types/api.ts
index 3af6c34..bc6180b 100644
--- a/frontend/src/types/api.ts
+++ b/frontend/src/types/api.ts
@@ -1,5 +1,11 @@
 /** 后端 API 响应类型 */
 
+// ============================================================
+// 生命周期阶段 — 区分「生产阶段的测试(发货测试)」与「出库后返厂(售后维修)」
+// ============================================================
+
+export type LifecyclePhase = "PRODUCTION" | "AFTER_SALES";
+
 // ============================================================
 // 任务状态常量
 // ============================================================
@@ -97,6 +103,8 @@ export interface ProductScanResponse {
   current_location_id: string | null;
   status: string;
   overall_status: string | null;
+  /** 🔧 生命周期阶段：PRODUCTION(生产制造/发货测试) | AFTER_SALES(出库后返厂售后维修) */
+  lifecycle_phase?: LifecyclePhase;
   created_at: string;
   top_level_tasks: TaskSummary[];
   /** 完整递归任务树 — 供十字矩阵树状图渲染 */