diff --git a/packages-user/data-common/src/replay/array.test.ts b/packages-user/data-common/src/replay/array.test.ts
index 3ace168..461d84e 100644
--- a/packages-user/data-common/src/replay/array.test.ts
+++ b/packages-user/data-common/src/replay/array.test.ts
@@ -1,4 +1,4 @@
-// 测试 ReplayArray 构件级行为：单类型参数编解码与单数组操作单次读回、不可编码参数丢弃后的计数与偏移对齐
+// 测试 ReplayArray 构件级行为：单类型参数编解码与单数组操作单次读回、不可编码参数丢弃后的计数与偏移对齐、乘数恰为 1 的边界
 import { logger } from '@motajs/common';
 import { afterAll, describe, expect, it, vi } from 'vitest';
 import { ReplayArray } from './array';
@@ -1056,6 +1056,33 @@ describe('ReplayArray expand and width warnings', () => {
         expect(info.map(v => v.code)).toEqual([149, 149]);
     });
 
+    // 验证扩容乘数恰为 1 时按码 149 拒绝两个乘数并回退倍率，扩容仍能终止且全部步骤读回
+    it('warns code 149 and still expands when an expand multiplier is exactly 1', () => {
+        const { ret, info } = logger.catch(() =>
+            createArray({
+                initCommandLength: 2,
+                initParamLength: 8,
+                commandExpandMultiplier: 1,
+                paramExpandMultiplier: 1
+            })
+        );
+        const array = ret;
+
+        expect(info.map(v => v.code)).toEqual([149, 149]);
+
+        for (let i = 0; i < 15; i++) {
+            array.add(i, [i]);
+        }
+
+        expect(array.length).toBe(15);
+        const stream = array.createReadStream(0);
+        for (let i = 0; i < 15; i++) {
+            expectStepTyped(stream.read()!, i, [i], i + 1);
+        }
+        expect(stream.read()).toBeNull();
+        expect(stream.index).toBe(15);
+    });
+
     // 验证指令数组达到上限后触发告警码 150
     it('warns code 150 when the command array is full', () => {
         const array = createArray({
diff --git a/packages-user/data-common/src/replay/array.ts b/packages-user/data-common/src/replay/array.ts
index dbeb872..9b0736e 100644
--- a/packages-user/data-common/src/replay/array.ts
+++ b/packages-user/data-common/src/replay/array.ts
@@ -110,7 +110,7 @@ export class ReplayArray implements IReplayArray {
         this.commandMax = config.commandMaxLength;
         this.paramMax = config.paramMaxLength;
 
-        if (config.commandExpandMultiplier < 1) {
+        if (config.commandExpandMultiplier <= 1) {
             const str = config.commandExpandMultiplier.toString();
             logger.warn(149, 'command', str);
             this.commandExpand = 2;
@@ -118,7 +118,7 @@ export class ReplayArray implements IReplayArray {
             this.commandExpand = config.commandExpandMultiplier;
         }
 
-        if (config.paramExpandMultiplier < 1) {
+        if (config.paramExpandMultiplier <= 1) {
             const str = config.paramExpandMultiplier.toString();
             logger.warn(149, 'param', str);
             this.paramExpand = 2;