diff --git a/backend/services/mining-admin-service/src/api/controllers/audit.controller.ts b/backend/services/mining-admin-service/src/api/controllers/audit.controller.ts
index 4d897b42..d3abd533 100644
--- a/backend/services/mining-admin-service/src/api/controllers/audit.controller.ts
+++ b/backend/services/mining-admin-service/src/api/controllers/audit.controller.ts
@@ -28,6 +28,7 @@ export class AuditController {
       adminId,
       action,
       resource,
+      keyword,
       page: page ?? 1,
       pageSize: pageSize ?? 20,
     });
@@ -37,7 +38,7 @@ export class AuditController {
       items: result.data.map((log: any) => ({
         id: log.id,
         adminId: log.adminId,
-        adminUsername: log.admin?.username || 'unknown',
+        adminUsername: log.admin?.username || (log.action === 'LOGIN_FAILED' ? log.resourceId : null) || 'unknown',
         action: log.action,
         resource: log.resource,
         resourceId: log.resourceId,
diff --git a/backend/services/mining-admin-service/src/application/services/dashboard.service.ts b/backend/services/mining-admin-service/src/application/services/dashboard.service.ts
index d11e4f1c..4ca48a4c 100644
--- a/backend/services/mining-admin-service/src/application/services/dashboard.service.ts
+++ b/backend/services/mining-admin-service/src/application/services/dashboard.service.ts
@@ -575,6 +575,7 @@ export class DashboardService {
     adminId?: string;
     action?: string;
     resource?: string;
+    keyword?: string;
     page?: number;
     pageSize?: number;
   }): Promise<{ data: any[]; total: number; pagination: any }> {
@@ -582,6 +583,12 @@ export class DashboardService {
     if (options.adminId) where.adminId = options.adminId;
     if (options.action) where.action = options.action;
     if (options.resource) where.resource = options.resource;
+    if (options.keyword) {
+      where.OR = [
+        { resourceId: { contains: options.keyword, mode: 'insensitive' } },
+        { admin: { username: { contains: options.keyword, mode: 'insensitive' } } },
+      ];
+    }
 
     const page = options.page ?? 1;
     const pageSize = options.pageSize ?? 50;
diff --git a/frontend/mining-admin-web/src/app/(dashboard)/audit-logs/page.tsx b/frontend/mining-admin-web/src/app/(dashboard)/audit-logs/page.tsx
index 9f7951a0..83995818 100644
--- a/frontend/mining-admin-web/src/app/(dashboard)/audit-logs/page.tsx
+++ b/frontend/mining-admin-web/src/app/(dashboard)/audit-logs/page.tsx
@@ -41,6 +41,25 @@ const actionLabels: Record<string, { label: string; className: string }> = {
   INIT:       { label: '初始化', className: 'bg-slate-100 text-slate-600' },
 };
 
+const loginFailedReasonLabels: Record<string, string> = {
+  user_not_found:   '用户名不存在',
+  account_disabled: '账号已禁用',
+  wrong_password:   '密码错误',
+};
+
+function formatDetails(details: string | null, action: string): string {
+  if (!details) return '-';
+  if (action === 'LOGIN_FAILED') {
+    try {
+      const parsed = JSON.parse(details);
+      return loginFailedReasonLabels[parsed.reason] || parsed.reason || details;
+    } catch {
+      return details;
+    }
+  }
+  return details;
+}
+
 const resourceLabels: Record<string, string> = {
   AUTH:                          '认证',
   CONFIG:                        '系统配置',
@@ -145,6 +164,7 @@ export default function AuditLogsPage() {
               ) : (
                 items.map((log) => {
                   const actionInfo = actionLabels[log.action] || { label: log.action, className: '' };
+                  const detailDisplay = formatDetails(log.details, log.action);
                   return (
                     <TableRow key={log.id}>
                       <TableCell className="text-sm">{formatDateTime(log.createdAt)}</TableCell>
@@ -158,8 +178,8 @@ export default function AuditLogsPage() {
                       </TableCell>
                       <TableCell>{resourceLabels[log.resource] || log.resource}</TableCell>
                       <TableCell className="font-mono text-xs">{log.resourceId || '-'}</TableCell>
-                      <TableCell className="max-w-[200px] truncate" title={log.details || ''}>
-                        {log.details || '-'}
+                      <TableCell className="max-w-[200px] truncate" title={detailDisplay}>
+                        {detailDisplay}
                       </TableCell>
                       <TableCell className="font-mono text-xs">{log.ipAddress}</TableCell>
                     </TableRow>