diff --git a/demo/data.json b/demo/data.json
index 7d11cc3..555878f 100644
--- a/demo/data.json
+++ b/demo/data.json
@@ -32,7 +32,7 @@
               "id": 1101,
               "name": "试验方案设计与<span style='font-weight: bold;color:red;'>伦理审查</span>",
               "assignee": "方案设计师 李明",
-              "avatar": "https://i.pravatar.cc/50?img=1",
+              "avatar": "50-1.jpg",
               "startDate": "2025-01-01",
               "endDate": "2025-02-28",
               "progress": 100,
@@ -47,7 +47,7 @@
               "id": 1102,
               "name": "受试者招募与筛选",
               "assignee": "招募专员 张丽",
-              "avatar": "https://i.pravatar.cc/50?img=5",
+              "avatar": "50-2.jpg",
               "startDate": "2025-03-01",
               "endDate": "2025-04-30",
               "progress": 90,
@@ -63,7 +63,7 @@
               "id": 1103,
               "name": "药物给药与安全性监测",
               "assignee": "临床医生 Dr. Liu",
-              "avatar": "https://i.pravatar.cc/50?img=8",
+              "avatar": "50-3.jpg",
               "startDate": "2025-05-01",
               "endDate": "2025-08-31",
               "progress": 40,
@@ -96,7 +96,7 @@
               "id": 1201,
               "name": "多中心试验<span style='font-weight: bold; color: blue;'>启动</span>",
               "assignee": "项目经理 王芳",
-              "avatar": "https://i.pravatar.cc/50?img=10",
+              "avatar": "50-10.jpg",
               "startDate": "2025-09-01",
               "endDate": "2025-11-30",
               "progress": 25,
@@ -112,7 +112,7 @@
               "id": 1202,
               "name": "患者入组与随机化",
               "assignee": "数据管理员 陈静",
-              "avatar": "https://i.pravatar.cc/50?img=20",
+              "avatar": "50-6.jpg",
               "startDate": "2025-12-01",
               "endDate": "2026-03-31",
               "progress": 0,
@@ -128,7 +128,7 @@
               "id": 1203,
               "name": "疗效评估与数据收集",
               "assignee": "统计师 赵磊",
-              "avatar": "https://i.pravatar.cc/50?img=15",
+              "avatar": "50-8.jpg",
               "startDate": "2026-01-01",
               "endDate": "2026-08-31",
               "progress": 0,
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