diff --git a/src/exchanges/lighter/gateway.ts b/src/exchanges/lighter/gateway.ts
index 4b8189c..f6b90ad 100644
--- a/src/exchanges/lighter/gateway.ts
+++ b/src/exchanges/lighter/gateway.ts
@@ -133,7 +133,7 @@ const RESOLUTION_MS: Record<string, number> = {
   "1d": 86_400_000,
 };
 
-const TERMINAL_ORDER_STATUSES = new Set(["filled", "canceled", "cancelled", "expired"]);
+const TERMINAL_ORDER_STATUSES = new Set(["filled", "canceled", "cancelled", "expired", "canceled-post-only"]);
 
 export interface LighterGatewayOptions {
   symbol: string; // display symbol used by strategy logging
diff --git a/src/exchanges/lighter/types.ts b/src/exchanges/lighter/types.ts
index 7a57197..9a3e13e 100644
--- a/src/exchanges/lighter/types.ts
+++ b/src/exchanges/lighter/types.ts
@@ -29,8 +29,8 @@ export interface LighterOrder {
   time_in_force?: string;
   trigger_price?: string;
   reduce_only?: boolean;
-  status?: string;
-  trigger_status?: string;
+  status?: string | number;
+  trigger_status?: string | number;
   trigger_time?: number;
   updated_at?: number;
   created_at?: number;
diff --git a/src/strategy/offset-maker-engine.ts b/src/strategy/offset-maker-engine.ts
index 91168b7..fc72140 100644
--- a/src/strategy/offset-maker-engine.ts
+++ b/src/strategy/offset-maker-engine.ts
@@ -546,7 +546,10 @@ export class OffsetMakerEngine {
           this.lastEntryOrderBySide[target.side] = { price: target.price, ts: Date.now() };
         }
       } catch (error) {
-        this.tradeLog.push("error", `挂单失败(${target.side} ${target.price}): ${String(error)}`);
+        const dustClosed = await this.tryDustMarketClose(target, error);
+        if (!dustClosed) {
+          this.tradeLog.push("error", `挂单失败(${target.side} ${target.price}): ${String(error)}`);
+        }
       }
     }
   }
@@ -713,4 +716,52 @@ export class OffsetMakerEngine {
   private getReferencePrice(): number | null {
     return getMidOrLast(this.depthSnapshot, this.tickerSnapshot);
   }
+
+  private isInvalidAmountError(error: unknown): boolean {
+    const message =
+      typeof error === "string"
+        ? error
+        : error instanceof Error
+          ? error.message
+          : JSON.stringify(error);
+    if (!message) return false;
+    if (message.includes("\"code\":21706")) return true;
+    return message.toLowerCase().includes("invalid order base or quote amount");
+  }
+
+  private async tryDustMarketClose(target: DesiredOrder, error: unknown): Promise<boolean> {
+    if (!target.reduceOnly) return false;
+    if (!this.isInvalidAmountError(error)) return false;
+    const position = getPosition(this.accountSnapshot, this.config.symbol);
+    const absQty = Math.abs(target.amount);
+    if (absQty < EPS) return false;
+    const { topBid, topAsk } = getTopPrices(this.depthSnapshot);
+    try {
+      await marketClose(
+        this.exchange,
+        this.config.symbol,
+        this.openOrders,
+        this.locks,
+        this.timers,
+        this.pending,
+        target.side,
+        absQty,
+        (type, detail) => this.tradeLog.push(type, detail),
+        {
+          markPrice: position.markPrice,
+          expectedPrice:
+            target.side === "SELL"
+              ? (topBid != null ? Number(topBid) : null)
+              : (topAsk != null ? Number(topAsk) : null),
+          maxPct: this.config.maxCloseSlippagePct,
+        },
+        { qtyStep: this.qtyStep }
+      );
+      this.tradeLog.push("order", `小额仓位使用市价平仓 ${target.side} 数量 ${absQty.toFixed(6)}`);
+      return true;
+    } catch (closeError) {
+      this.tradeLog.push("error", `小额市价平仓失败: ${String(closeError)}`);
+      return false;
+    }
+  }
 }