diff --git a/packages/chart/timeline/index.md b/packages/chart/timeline/index.md
index 3913e0ac3d..e537ad25ac 100644
--- a/packages/chart/timeline/index.md
+++ b/packages/chart/timeline/index.md
@@ -18,7 +18,7 @@ module: import { G2TimelineModule } from '@delon/chart/timeline';
 | `[delay]` | 延迟渲染，单位：毫秒 | `number` | `0` |
 | `[title]` | 图表标题 | `string,TemplateRef<void>` | - |
 | `[maxAxis]` | 最大指标数量 | `number` | `2` |
-| `[data]` | 数据 | `G2TimelineData[]` | - |
+| `[data]` | 数据，注：根据 `maxAxis` 值传递指标数据 | `G2TimelineData[]` | - |
 | `[titleMap]` | 指标别名 | `G2TimelineMap` | - |
 | `[colorMap]` | 颜色 | `G2TimelineMap` | `{ y1: '#5B8FF9', y2: '#5AD8A6', y3: '#5D7092', y4: '#F6BD16', y5: '#E86452' }` |
 | `[height]` | 高度值 | `number` | `400` |
diff --git a/packages/chart/timeline/timeline.component.ts b/packages/chart/timeline/timeline.component.ts
index c2dc86b07a..3c2cf27bb0 100644
--- a/packages/chart/timeline/timeline.component.ts
+++ b/packages/chart/timeline/timeline.component.ts
@@ -17,6 +17,11 @@ import { toDate } from '@delon/util/date-time';
 import { BooleanInput, InputBoolean, InputNumber, NumberInput } from '@delon/util/decorator';
 import type { NzSafeAny } from 'ng-zorro-antd/core/types';
 
+/**
+ * 数据
+ *
+ * 注：根据 `maxAxis` 值传递指标数据
+ */
 export interface G2TimelineData {
   /**
    * 时间值
@@ -25,7 +30,7 @@ export interface G2TimelineData {
   /** 指标1数据 */
   y1: number;
   /** 指标2数据 */
-  y2: number;
+  y2?: number;
   /** 指标3数据 */
   y3?: number;
   /** 指标4数据 */
@@ -39,7 +44,7 @@ export interface G2TimelineMap {
   /** 指标1 */
   y1: string;
   /** 指标 */
-  y2: string;
+  y2?: string;
   /** 指标3 */
   y3?: string;
   /** 指标4 */