diff --git a/src/app/@dataflow/extra/browser-setting-flow.ts b/src/app/@dataflow/extra/browser-setting-flow.ts
index d316476..7e50e0a 100644
--- a/src/app/@dataflow/extra/browser-setting-flow.ts
+++ b/src/app/@dataflow/extra/browser-setting-flow.ts
@@ -23,10 +23,23 @@ export interface IBrowserSetting {
 	 *  - 如果与 rclone 服务器响应时间小于 100ms(通常在局域网下), 可以适当调低数值
 	 */
 	'rng.request-interval': number;
+	/**
+	 * 速度图表的时间跨度, 速度图表只会保留最近一段时间内的数据
+	 *
+	 * 单位: 秒(s)
+	 *
+	 * 原则:
+	 *  - 应小于 `rng.request-interval`(转化为相同单位后)
+	 *
+	 * 影响范围:
+	 *  - dashboard 和 Job manager 中的速度图表时间跨度
+	 */
+	'rng.speedChart.windowSize': number;
 }
 
 export const brwoserSettingDefault: IBrowserSetting = {
 	'rng.request-interval': 3000,
+	'rng.speedChart.windowSize': 60,
 };
 
 export type NestedPartial<T> = {
diff --git a/src/app/@dataflow/extra/browser-setting-schema.json b/src/app/@dataflow/extra/browser-setting-schema.json
index ccaeb66..0e7ce32 100644
--- a/src/app/@dataflow/extra/browser-setting-schema.json
+++ b/src/app/@dataflow/extra/browser-setting-schema.json
@@ -8,9 +8,13 @@
 				"rng.request-interval": {
 					"description": "请求间隔, 需要定时从rclone服务器中获取数据的时间间隔.\n\n单位: 毫秒(ms)\n\n影响范围:\n  - 响应时间的刷新频率(位于主侧栏左上角)\n  - Dashboard 和 Job Manager 的更新间隔\n\n建议:\n  - 如果与 rclone 服务器响应时间小于 100ms(通常在局域网下), 可以适当调低数值",
 					"type": "number"
+				},
+				"rng.speedChart.windowSize": {
+					"description": "速度图表的时间跨度, 速度图表只会保留最近一段时间内的数据\n\n单位: 秒(s)\n\n原则:\n  - 应小于 `rng.request-interval`(转化为相同单位后)\n\n影响范围:\n  - dashboard 和 Job manager 中的速度图表时间跨度",
+					"type": "number"
 				}
 			},
-			"required": ["rng.request-interval"],
+			"required": ["rng.request-interval", "rng.speedChart.windowSize"],
 			"type": "object"
 		}
 	}
diff --git a/src/app/components/speed-chart/speed-chart.component.ts b/src/app/components/speed-chart/speed-chart.component.ts
index bbc4a0d..2fc9ace 100644
--- a/src/app/components/speed-chart/speed-chart.component.ts
+++ b/src/app/components/speed-chart/speed-chart.component.ts
@@ -4,6 +4,7 @@ import * as moment from 'moment';
 import { BaseChartDirective, Color } from 'ng2-charts';
 import { pairwise } from 'rxjs/operators';
 import { CoreStatsFlow } from '../../@dataflow/rclone';
+import { BrowserSettingService } from '../../pages/settings/browser-setting/browser-setting.service';
 import { FormatBytes } from '../../utils/format-bytes';
 
 @Component({
@@ -40,7 +41,7 @@ import { FormatBytes } from '../../utils/format-bytes';
 	],
 })
 export class RngSpeedChartComponent implements OnInit {
-	constructor() {}
+	constructor(private browserSettingService: BrowserSettingService) {}
 	public lineChartData: ChartDataSets[] = [
 		{
 			data: [
@@ -182,6 +183,9 @@ export class RngSpeedChartComponent implements OnInit {
 	speedDiff = 0;
 
 	ngOnInit() {
+		this.browserSettingService
+			.partialBrowserSetting$('rng.speedChart.windowSize')
+			.subscribe(([v, err]) => (this.treadhold = v));
 		const statsOut = this.stats$.getOutput();
 		statsOut.subscribe(node => {
 			if (node[1].length !== 0) return;