diff --git a/sundynix-desktop/frontend/src/App.tsx b/sundynix-desktop/frontend/src/App.tsx
index d74ef7e..d544164 100644
--- a/sundynix-desktop/frontend/src/App.tsx
+++ b/sundynix-desktop/frontend/src/App.tsx
@@ -263,7 +263,7 @@ export default function App() {
           {view === "home" ? (
             <Home onSelect={setView} />
           ) : view === "studio" ? (
-            <StudioView onRun={onRun} phase={run.phase} identity={identity} />
+            <StudioView onRun={onRun} phase={run.phase} identity={identity} readOnly={tenant?.role === "viewer"} />
           ) : view === "kb" ? (
             <KbView identity={identity} />
           ) : view === "report" ? (
diff --git a/sundynix-desktop/frontend/src/studio/StudioView.tsx b/sundynix-desktop/frontend/src/studio/StudioView.tsx
index 88316c3..37a3e8a 100644
--- a/sundynix-desktop/frontend/src/studio/StudioView.tsx
+++ b/sundynix-desktop/frontend/src/studio/StudioView.tsx
@@ -49,7 +49,7 @@ function buildExample(): { nodes: Node[]; edges: Edge[] } {
 }
 
 // 编排 Studio：左(节点面板 + 我的编排) · 中画布 · 右检查器 · 顶工具栏。
-export function StudioView({ onRun, phase, identity }: { onRun: (dsl: TaskDsl) => void; phase: RunPhase; identity: Identity }) {
+export function StudioView({ onRun, phase, identity, readOnly = false }: { onRun: (dsl: TaskDsl) => void; phase: RunPhase; identity: Identity; readOnly?: boolean }) {
   const toast = useToast();
   const { theme } = useTheme();
   const [nodes, setNodes, onNodesChange] = useNodesState<Node>([]);
@@ -185,10 +185,14 @@ export function StudioView({ onRun, phase, identity }: { onRun: (dsl: TaskDsl) =
   }, [phase, setNodes]);
 
   const run = useCallback(() => {
+    if (readOnly) {
+      toast.push("error", "当前身份为只读成员（viewer），无权在此租户运行编排");
+      return;
+    }
     const found = validate(nodes, edges);
     setIssues(found);
     if (!found.some((i) => i.level === "error")) onRun(exportDsl(nodes, edges));
-  }, [nodes, edges, onRun]);
+  }, [nodes, edges, onRun, readOnly, toast]);
 
   const selected = useMemo(() => nodes.find((n) => n.id === selId) ?? null, [nodes, selId]);
   const running = phase === "submitting" || phase === "streaming";
@@ -236,8 +240,8 @@ export function StudioView({ onRun, phase, identity }: { onRun: (dsl: TaskDsl) =
       {/* 中画布 */}
       <div className="relative flex-1 bg-ink-950">
         <div className="absolute left-0 right-0 top-0 z-10 flex flex-wrap items-center gap-1.5 border-b border-line bg-ink-900/90 px-2 py-1.5 backdrop-blur">
-          <Button variant="primary" size="sm" icon={Play} onClick={run} disabled={running || nodes.length === 0}>
-            {running ? "运行中…" : "运行"}
+          <Button variant="primary" size="sm" icon={Play} onClick={run} disabled={running || nodes.length === 0 || readOnly} title={readOnly ? "只读成员（viewer）无权在此租户运行编排" : undefined}>
+            {running ? "运行中…" : readOnly ? "只读" : "运行"}
           </Button>
           <Button size="sm" icon={ShieldCheck} onClick={() => setIssues(validate(nodes, edges))}>
             校验
diff --git a/sundynix-gateway/internal/middleware/auth.go b/sundynix-gateway/internal/middleware/auth.go
index 53630f5..53965ef 100644
--- a/sundynix-gateway/internal/middleware/auth.go
+++ b/sundynix-gateway/internal/middleware/auth.go
@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"context"
 	"net/http"
 	"os"
 	"strconv"
@@ -9,6 +10,7 @@ import (
 	"github.com/gin-gonic/gin"
 
 	"github.com/sundynix/sundynix-gateway/internal/auth"
+	"github.com/sundynix/sundynix-gateway/internal/store"
 )
 
 // CtxUserID 是鉴权后写入 gin.Context 的已验证用户 ID 键。
@@ -75,6 +77,35 @@ func RequireAdmin() gin.HandlerFunc {
 	}
 }
 
+// MemberRoleResolver 解析用户在某租户的角色（*store.Postgres 天然满足）。抽成接口便于单测门控逻辑。
+type MemberRoleResolver interface {
+	MemberRole(ctx context.Context, tenantID, userID string) string
+}
+
+// RequireTenantRole 要求当前用户在活跃租户中的角色不低于 minRole（按 store.RoleRank 阶梯）。
+// 须挂在 RequireAuth + TenantContext 之后（依赖已注入的 uid 与 tenant_id）。
+// 无租户上下文（正常不会：TenantContext 兜底补建默认租户）或非成员 → rank 0 → 拦下。
+// 复用中间件：当前仅接 SubmitTask（≥member，挡只读 viewer 烧租户积分）；将来成员自管/共享
+// 工作区上线，直接给对应写路由挂上更高 minRole 即生效，无需改 handler。
+func RequireTenantRole(db MemberRoleResolver, minRole string) gin.HandlerFunc {
+	min := store.RoleRank(minRole)
+	return func(c *gin.Context) {
+		uid, _ := c.Get(CtxUserID)
+		id, _ := uid.(string)
+		if id == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "需要登录"})
+			return
+		}
+		tid, _ := c.Get(CtxTenantID)
+		tenant, _ := tid.(string)
+		if store.RoleRank(db.MemberRole(c.Request.Context(), tenant, id)) < min {
+			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "当前角色为只读，无权执行该操作"})
+			return
+		}
+		c.Next()
+	}
+}
+
 func splitEnv(key string) []string {
 	var out []string
 	for _, p := range strings.Split(os.Getenv(key), ",") {
diff --git a/sundynix-gateway/internal/middleware/tenant_role_test.go b/sundynix-gateway/internal/middleware/tenant_role_test.go
new file mode 100644
index 0000000..51eeef3
--- /dev/null
+++ b/sundynix-gateway/internal/middleware/tenant_role_test.go
@@ -0,0 +1,63 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/sundynix/sundynix-gateway/internal/store"
+)
+
+// fakeRoleResolver 按 (tenant,user) 返回预置角色，用于隔离测试门控逻辑（不碰 DB）。
+type fakeRoleResolver struct{ role string }
+
+func (f fakeRoleResolver) MemberRole(context.Context, string, string) string { return f.role }
+
+// 组装一条 /tasks 路由，模拟 RequireAuth+TenantContext 已注入 uid/tenant_id，再挂门控。
+func roleGateEngine(uid, tenant, memberRole, minRole string) *gin.Engine {
+	gin.SetMode(gin.TestMode)
+	r := gin.New()
+	r.Use(func(c *gin.Context) {
+		if uid != "" {
+			c.Set(CtxUserID, uid)
+		}
+		if tenant != "" {
+			c.Set(CtxTenantID, tenant)
+		}
+		c.Next()
+	})
+	r.POST("/tasks", RequireTenantRole(fakeRoleResolver{role: memberRole}, minRole),
+		func(c *gin.Context) { c.String(http.StatusOK, "submitted") })
+	return r
+}
+
+func TestRequireTenantRole_Gate(t *testing.T) {
+	cases := []struct {
+		name       string
+		uid        string
+		tenant     string
+		memberRole string
+		wantCode   int
+	}{
+		{"owner 放行", "u1", "t1", store.RoleOwner, http.StatusOK},
+		{"admin 放行", "u1", "t1", store.RoleAdmin, http.StatusOK},
+		{"member 放行", "u1", "t1", store.RoleMember, http.StatusOK},
+		{"billing_admin 拦下(财务只读不能提交)", "u1", "t1", store.RoleBillingAdmin, http.StatusForbidden},
+		{"viewer 拦下(只读不能提交)", "u1", "t1", store.RoleViewer, http.StatusForbidden},
+		{"非成员(空角色) 拦下", "u1", "t1", "", http.StatusForbidden},
+		{"未登录 401", "", "t1", store.RoleOwner, http.StatusUnauthorized},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			r := roleGateEngine(tc.uid, tc.tenant, tc.memberRole, store.RoleMember)
+			w := httptest.NewRecorder()
+			r.ServeHTTP(w, httptest.NewRequest(http.MethodPost, "/tasks", nil))
+			if w.Code != tc.wantCode {
+				t.Errorf("状态码=%d, 期望 %d（body=%s）", w.Code, tc.wantCode, w.Body.String())
+			}
+		})
+	}
+}
diff --git a/sundynix-gateway/internal/router/router.go b/sundynix-gateway/internal/router/router.go
index d8a4ce9..296e227 100644
--- a/sundynix-gateway/internal/router/router.go
+++ b/sundynix-gateway/internal/router/router.go
@@ -53,7 +53,7 @@ func New(db *store.Postgres, cache *store.Redis, bus *nats.Bus, blobStore *blob.
 		// —— 受保护：owner 作用域业务，必须携带有效 JWT ——
 		p := api.Group("", middleware.RequireAuth())
 		{
-			p.POST("/tasks", h.SubmitTask)              // 解析 DSL 并 Publish 到 NATS（带已验证 uid）
+			p.POST("/tasks", middleware.RequireTenantRole(db, store.RoleMember), h.SubmitTask) // 提交任务(烧租户积分)：viewer 只读拦下
 			p.GET("/tasks/:id", h.TaskStatus)           // 任务生命周期状态（UI 轮询 submitted/running/done/failed/timeout/waiting/rejected）
 			p.POST("/tasks/:id/approve", middleware.Audit(db), h.ApproveTask) // HITL 人工审批决定（批准/拒绝，审计）
 			p.GET("/tenants/current", h.TenantCurrent)  // 当前租户上下文 + 角色 + 可花余额（多租户）
diff --git a/sundynix-gateway/internal/store/role_test.go b/sundynix-gateway/internal/store/role_test.go
new file mode 100644
index 0000000..0f7b30b
--- /dev/null
+++ b/sundynix-gateway/internal/store/role_test.go
@@ -0,0 +1,24 @@
+package store
+
+import "testing"
+
+// RoleRank 是 RequireTenantRole 门控的判定核心：阶梯顺序 + billing_admin 与 viewer 同为只读 + 未知记 0。
+func TestRoleRank(t *testing.T) {
+	if !(RoleRank(RoleOwner) > RoleRank(RoleAdmin) &&
+		RoleRank(RoleAdmin) > RoleRank(RoleMember) &&
+		RoleRank(RoleMember) > RoleRank(RoleViewer)) {
+		t.Fatal("阶梯应为 owner > admin > member > viewer")
+	}
+	if RoleRank(RoleBillingAdmin) != RoleRank(RoleViewer) {
+		t.Errorf("billing_admin 应与 viewer 同为只读级：%d vs %d", RoleRank(RoleBillingAdmin), RoleRank(RoleViewer))
+	}
+	if RoleRank(RoleBillingAdmin) >= RoleRank(RoleMember) {
+		t.Error("billing_admin(财务只读) 不应达到 member 操作级，否则能提交烧积分")
+	}
+	if RoleRank(RoleViewer) < RoleRank(RoleMember) == false {
+		t.Error("viewer 应低于 member（提交任务门控靠此挡下）")
+	}
+	if RoleRank("") != 0 || RoleRank("nonsense") != 0 {
+		t.Error("未知/非成员角色应记 0，一律拦下")
+	}
+}
diff --git a/sundynix-gateway/internal/store/tenant.go b/sundynix-gateway/internal/store/tenant.go
index 565c66c..749b4c3 100644
--- a/sundynix-gateway/internal/store/tenant.go
+++ b/sundynix-gateway/internal/store/tenant.go
@@ -28,6 +28,24 @@ const (
 	RoleBillingAdmin = "billing_admin"
 )
 
+// RoleRank 返回角色在「操作/管理」阶梯上的等级（越大权越高），供 RequireTenantRole 门控。
+// 语义：viewer 与 billing_admin 均为只读(1)——billing_admin 是「财务只读」角色，管账不跑任务，
+// 故不能提交(烧租户积分)；member 可操作(2)；admin(3)/owner(4) 递增管理权。
+// 未知角色 / 非成员（空串）记 0，一律拦下。当前唯一接入点：SubmitTask 要求 ≥ member（挡 viewer/billing_admin 烧租户积分）。
+func RoleRank(role string) int {
+	switch role {
+	case RoleOwner:
+		return 4
+	case RoleAdmin:
+		return 3
+	case RoleMember:
+		return 2
+	case RoleViewer, RoleBillingAdmin:
+		return 1
+	}
+	return 0
+}
+
 // CreateTenant 建一个租户。
 func (p *Postgres) CreateTenant(ctx context.Context, name, slug, plan string) (*Tenant, error) {
 	if p.db == nil {