diff --git a/src/renderer/game/engine/sim/WorldSim.ts b/src/renderer/game/engine/sim/WorldSim.ts
index 70881c6..2eec4dc 100644
--- a/src/renderer/game/engine/sim/WorldSim.ts
+++ b/src/renderer/game/engine/sim/WorldSim.ts
@@ -25,6 +25,10 @@ export class WorldSim {
   }
 
   tick(): void {
+    // 0.1.39 根治双闸：clocks.ts 外部守卫 + 此处入口二次守卫。
+    // 与 tournament/apprentice 等系统卡同模式（sysEnabled ?? true 兜底，
+    // 注册后默认开、关停后 false）。防止未来新增直接调 tick() 的路径绕过守卫。
+    if (!this.w.sysEnabled('worldsim')) return
     const s = this.s()
     const rng = this.w.rng
     // ---- C. 灵气潮汐（大周期） ----
diff --git a/tests/worldsim-freeze-0.1.39.test.ts b/tests/worldsim-freeze-0.1.39.test.ts
new file mode 100644
index 0000000..f69f79c
--- /dev/null
+++ b/tests/worldsim-freeze-0.1.39.test.ts
@@ -0,0 +1,107 @@
+/**
+ * 0.1.39 P3：worldsim 能力卡关停根治测试
+ * 验证关停后世界自主演进完全冻结——潮汐、NPC 动力学、时代弧、快讯不再推进。
+ * 注意：玩家行为（修炼耗草→tradeSettle 回写池、买卖交易回写池）不受 worldsim
+ * 能力卡关停影响——这是玩家与世界的交互而非世界自主演进。
+ */
+import { describe, expect, it } from 'vitest'
+import { World } from '../src/renderer/game/engine/runtime/World'
+import { WorldSim } from '../src/renderer/game/engine/sim/WorldSim'
+import { resetSaveBus, attachLogSink } from './world.helpers'
+import type { WorldSimState } from '../src/renderer/game/engine/sim/worldsim-data'
+
+function baseWorld(seed: string): World {
+  const w = World.create({ seed, surname: '封', familyName: '封家', motto: 'm', difficulty: 'normal' })
+  resetSaveBus()
+  attachLogSink(w)
+  return w
+}
+
+describe('0.1.39 worldsim 关停根治', () => {
+  it('sysEnabled("worldsim") 默认开 → toggleSystem 后关', () => {
+    const w = baseWorld('ws-toggle-1')
+    expect(w.sysEnabled('worldsim')).toBe(true)
+    const after = w.toggleSystem('worldsim')
+    expect(after).toBe(false)
+    expect(w.sysEnabled('worldsim')).toBe(false)
+  })
+
+  it('关停后 tick() 直接 return（入口双闸守卫）', () => {
+    const w = baseWorld('ws-freeze-1')
+    // 推进 12 月让 worldSim 有初始状态
+    for (let i = 0; i < 12; i++) w.advanceMonth()
+    const ws = w.state.worldSim as WorldSimState
+    expect(ws).toBeDefined()
+
+    // 快照关键字段
+    const tideBefore = ws.tide
+    const tideTicksBefore = ws.tideTicks
+    const poolBefore = { ...ws.marketPool }
+
+    // 关停 worldsim
+    w.toggleSystem('worldsim')
+    expect(w.sysEnabled('worldsim')).toBe(false)
+
+    // 直接调 tick() 应被入口守卫拦截
+    new WorldSim(w).tick()
+
+    // 状态完全冻结（tick 内所有逻辑未执行）
+    expect(ws.tide).toBe(tideBefore)
+    expect(ws.tideTicks).toBe(tideTicksBefore)
+    expect(ws.marketPool).toEqual(poolBefore)
+  })
+
+  it('关停后 advanceMonth 不再自主演进世界（潮汐/NPC/时代弧/快讯冻结）', () => {
+    const w = baseWorld('ws-freeze-2')
+    // 推进 24 月让世界有实质演化
+    for (let i = 0; i < 24; i++) w.advanceMonth()
+    const ws = w.state.worldSim as WorldSimState
+    expect(ws).toBeDefined()
+
+    // 快照世界自主演进指标
+    const tideTicksBefore = ws.tideTicks
+    const npcDynBefore = JSON.stringify(ws.npcDyn)
+    const secretQiBefore = JSON.stringify(ws.secretQi)
+    const eraBefore = ws.era
+    const newsLenBefore = ws.newsFeed.length
+    const calamityBefore = ws.calamity
+    const warFatigueBefore = ws.warFatigue
+
+    // 关停
+    w.toggleSystem('worldsim')
+
+    // 推进 36 月——世界自主演进应纹丝不动
+    for (let i = 0; i < 36; i++) w.advanceMonth()
+
+    // tick 内逻辑全部冻结
+    expect(ws.tideTicks).toBe(tideTicksBefore)        // 潮汐不推进
+    expect(JSON.stringify(ws.npcDyn)).toBe(npcDynBefore) // NPC 动力学不变
+    expect(JSON.stringify(ws.secretQi)).toBe(secretQiBefore) // 秘境灵气不自恢复
+    expect(ws.era).toBe(eraBefore)                    // 时代弧不变
+    expect(ws.newsFeed.length).toBe(newsLenBefore)    // 无新快讯
+    expect(ws.calamity).toBe(calamityBefore)          // 灾年状态不变
+    expect(ws.warFatigue).toBe(warFatigueBefore)      // 战争疲劳不变
+  })
+
+  it('重新开启后世界恢复演进（可逆性）', () => {
+    const w = baseWorld('ws-resume-1')
+    for (let i = 0; i < 12; i++) w.advanceMonth()
+    const ws = w.state.worldSim as WorldSimState
+
+    // 关停 12 月
+    w.toggleSystem('worldsim')
+    const tideFrozen = ws.tide
+    const ticksFrozen = ws.tideTicks
+    for (let i = 0; i < 12; i++) w.advanceMonth()
+    expect(ws.tide).toBe(tideFrozen)
+    expect(ws.tideTicks).toBe(ticksFrozen)
+
+    // 重新开启
+    w.toggleSystem('worldsim')
+    expect(w.sysEnabled('worldsim')).toBe(true)
+    for (let i = 0; i < 12; i++) w.advanceMonth()
+
+    // 世界恢复演进——tideTicks 必须增长
+    expect(ws.tideTicks).toBeGreaterThan(ticksFrozen)
+  })
+})