diff --git a/src/strategy/maker-points-engine.ts b/src/strategy/maker-points-engine.ts
index b855858..0513b27 100644
--- a/src/strategy/maker-points-engine.ts
+++ b/src/strategy/maker-points-engine.ts
@@ -128,6 +128,7 @@ export class MakerPointsEngine {
   private processing = false;
   private stopLossProcessing = false;
   private stopLossCooldownUntil = 0;
+  private forceTickRequested = false;
   private desiredOrders: DesiredOrder[] = [];
   private accountUnrealized = 0;
   private initialOrderSnapshotReady = false;
@@ -341,6 +342,10 @@ export class MakerPointsEngine {
         this.lastStandxDepthTime = Date.now();
         this.feedStatus.depth = true;
         this.emitUpdate();
+        if (this.shouldTriggerImmediateDepthProtection(depth)) {
+          this.forceTickRequested = true;
+          void this.tick();
+        }
       },
       log,
       {
@@ -568,7 +573,9 @@ export class MakerPointsEngine {
     this.processing = true;
     let hadRateLimit = false;
     try {
-      const decision = this.rateLimit.beforeCycle();
+      const forceRun = this.forceTickRequested;
+      this.forceTickRequested = false;
+      const decision = forceRun ? "run" : this.rateLimit.beforeCycle();
       if (decision === "paused") {
         this.emitUpdate();
         return;
@@ -864,6 +871,43 @@ export class MakerPointsEngine {
     return changed;
   }
 
+  /**
+   * 当深度从“满足阈值”切换到“不满足阈值”时，立即触发一次主循环，优先撤销不再安全的挂单。
+   */
+  private shouldTriggerImmediateDepthProtection(depth: AsterDepth | null): boolean {
+    if (!depth) return false;
+    if (this.defenseMode || this.reconnectResetPending || this.stopLossProcessing) return false;
+
+    const minDepth = this.config.filterMinDepth;
+    if (minDepth <= 0) return false;
+
+    const { topBid, topAsk } = getTopPrices(depth);
+    if (topBid == null || topAsk == null) return false;
+
+    const targets = buildBpsTargets({
+      band0To10: this.config.enableBand0To10,
+      band10To30: this.config.enableBand10To30,
+      band30To100: this.config.enableBand30To100,
+    });
+
+    for (const bps of targets) {
+      const lastStatus = this.lastDepthOkStatus[bps];
+      if (!lastStatus) continue;
+
+      const buyPrice = topBid * (1 - bps / 10000);
+      const sellPrice = topAsk * (1 + bps / 10000);
+      const buyDepthQty = getDepthBetweenPrices(depth, "BUY", buyPrice);
+      const sellDepthQty = getDepthBetweenPrices(depth, "SELL", sellPrice);
+      const currentBuyOk = buyDepthQty >= minDepth;
+      const currentSellOk = sellDepthQty >= minDepth;
+
+      if (lastStatus.buy && !currentBuyOk) return true;
+      if (lastStatus.sell && !currentSellOk) return true;
+    }
+
+    return false;
+  }
+
   private buildCloseOnlyOrders(
     position: PositionSnapshot,
     bid1: number,
diff --git a/tests/maker-points-immediate-depth-protection.test.ts b/tests/maker-points-immediate-depth-protection.test.ts
new file mode 100644
index 0000000..37fe5cd
--- /dev/null
+++ b/tests/maker-points-immediate-depth-protection.test.ts
@@ -0,0 +1,97 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import type { ExchangeAdapter } from "../src/exchanges/adapter";
+import type { AsterAccountSnapshot, AsterDepth, AsterKline, AsterOrder, AsterTicker } from "../src/exchanges/types";
+import { MakerPointsEngine } from "../src/strategy/maker-points-engine";
+
+class StubAdapter implements ExchangeAdapter {
+  id = "standx";
+
+  private depthListeners: Array<(depth: AsterDepth) => void> = [];
+
+  supportsTrailingStops(): boolean {
+    return false;
+  }
+
+  watchAccount(_cb: (snapshot: AsterAccountSnapshot) => void): void {}
+  watchOrders(_cb: (orders: AsterOrder[]) => void): void {}
+  watchTicker(_symbol: string, _cb: (ticker: AsterTicker) => void): void {}
+  watchKlines(_symbol: string, _interval: string, _cb: (klines: AsterKline[]) => void): void {}
+
+  watchDepth(_symbol: string, cb: (depth: AsterDepth) => void): void {
+    this.depthListeners.push(cb);
+  }
+
+  emitDepth(depth: AsterDepth): void {
+    for (const listener of this.depthListeners) {
+      listener(depth);
+    }
+  }
+
+  async createOrder(): Promise<AsterOrder> {
+    throw new Error("not implemented");
+  }
+
+  async cancelOrder(): Promise<void> {}
+  async cancelOrders(): Promise<void> {}
+  async cancelAllOrders(): Promise<void> {}
+
+  async queryAccountSnapshot(): Promise<AsterAccountSnapshot | null> {
+    return null;
+  }
+}
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.useRealTimers();
+});
+
+describe("MakerPointsEngine immediate depth protection", () => {
+  it("triggers an immediate tick when depth drops below threshold", () => {
+    vi.useFakeTimers();
+    const adapter = new StubAdapter();
+
+    const engine = new MakerPointsEngine(
+      {
+        symbol: "BTC-USD",
+        perOrderAmount: 0.01,
+        closeThreshold: 0,
+        stopLossUsd: 1,
+        refreshIntervalMs: 10_000,
+        maxLogEntries: 20,
+        maxCloseSlippagePct: 0.05,
+        priceTick: 0.1,
+        qtyStep: 0.001,
+        enableBand0To10: true,
+        enableBand10To30: false,
+        enableBand30To100: false,
+        band0To10Amount: 0.01,
+        band10To30Amount: 0.01,
+        band30To100Amount: 0.01,
+        minRepriceBps: 3,
+        enableBinanceDepthCancel: false,
+        filterMinDepth: 10,
+      },
+      adapter
+    );
+
+    (engine as any).feedStatus = { account: true, depth: true, ticker: true, orders: true, binance: true };
+    (engine as any).initialOrderSnapshotReady = true;
+    (engine as any).defenseMode = false;
+    (engine as any).reconnectResetPending = false;
+    (engine as any).stopLossProcessing = false;
+    (engine as any).lastDepthOkStatus[9] = { buy: true, sell: true };
+
+    const tickSpy = vi.spyOn(engine as any, "tick").mockResolvedValue(undefined);
+
+    adapter.emitDepth({
+      lastUpdateId: 1,
+      bids: [["100", "1"]],
+      asks: [["101", "1"]],
+      eventTime: Date.now(),
+      symbol: "BTC-USD",
+    });
+
+    expect(tickSpy).toHaveBeenCalledTimes(1);
+    engine.stop();
+  });
+});