diff --git a/openspec/changes/platform-tenant-switch/.openspec.yaml b/openspec/changes/archive/2026-10-12-platform-tenant-switch/.openspec.yaml
similarity index 100%
rename from openspec/changes/platform-tenant-switch/.openspec.yaml
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/.openspec.yaml
diff --git a/openspec/changes/platform-tenant-switch/design.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/design.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/design.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/design.md
diff --git a/openspec/changes/platform-tenant-switch/proposal.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/proposal.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/proposal.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/proposal.md
diff --git a/openspec/changes/platform-tenant-switch/specs/backend/auth/spec.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/backend/auth/spec.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/specs/backend/auth/spec.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/backend/auth/spec.md
diff --git a/openspec/changes/platform-tenant-switch/specs/frontend/AD/layout/spec.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/frontend/AD/layout/spec.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/specs/frontend/AD/layout/spec.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/frontend/AD/layout/spec.md
diff --git a/openspec/changes/platform-tenant-switch/specs/shared/api-contract/spec.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/shared/api-contract/spec.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/specs/shared/api-contract/spec.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/specs/shared/api-contract/spec.md
diff --git a/openspec/changes/platform-tenant-switch/tasks.md b/openspec/changes/archive/2026-10-12-platform-tenant-switch/tasks.md
similarity index 100%
rename from openspec/changes/platform-tenant-switch/tasks.md
rename to openspec/changes/archive/2026-10-12-platform-tenant-switch/tasks.md
diff --git a/openspec/specs/backend/auth/spec.md b/openspec/specs/backend/auth/spec.md
index 9e8850f..2e1f82d 100644
--- a/openspec/specs/backend/auth/spec.md
+++ b/openspec/specs/backend/auth/spec.md
@@ -67,3 +67,18 @@
 #### Scenario: 改密后清除
 - **WHEN** 待改密用户修改密码成功
 - **THEN** 其 must_change_password 置为 false
+
+### Requirement: 平台超管租户切换
+系统 SHALL 支持平台超管（`super_admin`）切入任意租户：`POST /auth/switch-tenant` 校验调用者为平台超管后签发 `super=true` 的新 token，其 `tenantCode` 为目标租户、`sub` 为超管真实 userId；切换后数据按目标租户过滤、权限按超管绕过。
+
+#### Scenario: 切换租户
+- **WHEN** 平台超管请求切入目标租户
+- **THEN** 返回新 token（tenantCode=目标租户、super=true）
+
+#### Scenario: 非超管切换被拒
+- **WHEN** 非平台超管请求切换租户
+- **THEN** 系统返回 403
+
+#### Scenario: 切换后数据隔离
+- **WHEN** 切换后的超管查询业务数据
+- **THEN** 返回目标租户的数据
diff --git a/openspec/specs/frontend/AD/layout/spec.md b/openspec/specs/frontend/AD/layout/spec.md
index 7722e9f..1717da6 100644
--- a/openspec/specs/frontend/AD/layout/spec.md
+++ b/openspec/specs/frontend/AD/layout/spec.md
@@ -85,6 +85,13 @@
 - **WHEN** 租户未配置某品牌字段
 - **THEN** 该字段回退为默认值（标题回退 name、主题色回退默认主色）
 
+### Requirement: 顶栏租户切换
+前端 SHALL 在顶栏为平台超管提供「切换租户」入口：列出全部租户，切换后替换 token、重置菜单/字典/权限等缓存并刷新。
+
+#### Scenario: 切换租户
+- **WHEN** 平台超管选择某租户并切换
+- **THEN** 前端更新 token、重置缓存，按目标租户渲染菜单与数据
+
 ### Requirement: 布局设置持久化
 所有布局与主题设置 SHALL 持久化到 localStorage，刷新页面后保持。
 
diff --git a/openspec/specs/shared/api-contract/spec.md b/openspec/specs/shared/api-contract/spec.md
index 5694d8e..29b33cd 100644
--- a/openspec/specs/shared/api-contract/spec.md
+++ b/openspec/specs/shared/api-contract/spec.md
@@ -115,3 +115,10 @@
 #### Scenario: 维护租户品牌
 - **WHEN** 管理员新增或编辑租户并填写品牌字段
 - **THEN** 品牌字段随 tenant 一并保存与返回
+
+### Requirement: 租户切换接口
+系统 SHALL 提供 `POST /auth/switch-tenant`（body 含 tenantCode，仅登录态），由平台超管调用，返回切换后的新 access/refresh token 与目标租户信息。
+
+#### Scenario: 切换租户
+- **WHEN** 平台超管请求 POST /auth/switch-tenant
+- **THEN** 返回新 token，后续请求按目标租户上下文执行