diff --git a/backend/apps/common/services/__init__.py b/backend/apps/common/services/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/backend/apps/common/services/system_log_service.py b/backend/apps/common/services/system_log_service.py
new file mode 100644
index 00000000..946ee159
--- /dev/null
+++ b/backend/apps/common/services/system_log_service.py
@@ -0,0 +1,78 @@
+import glob
+import json
+import logging
+import subprocess
+from datetime import datetime
+
+
+logger = logging.getLogger(__name__)
+
+
+class SystemLogService:
+    def __init__(self):
+        self.log_globs = [
+            "/app/backend/logs/*",
+            "/opt/xingrin/logs/*",
+        ]
+        self.default_lines = 200
+        self.max_lines = 10000
+        self.timeout_seconds = 3
+
+    def get_logs_content(self, lines: int | None = None) -> str:
+        if lines is None:
+            lines = self.default_lines
+
+        lines = int(lines)
+        if lines < 1:
+            lines = 1
+        if lines > self.max_lines:
+            lines = self.max_lines
+
+        files: list[str] = []
+        for pattern in self.log_globs:
+            matched = sorted(glob.glob(pattern))
+            if matched:
+                files = matched
+                break
+        if not files:
+            return ""
+
+        cmd = ["tail", "-q", "-n", str(lines), *files]
+
+        result = subprocess.run(
+            cmd,
+            capture_output=True,
+            text=True,
+            timeout=self.timeout_seconds,
+            check=False,
+        )
+
+        if result.returncode != 0:
+            logger.warning(
+                "tail command failed: returncode=%s stderr=%s",
+                result.returncode,
+                (result.stderr or "").strip(),
+            )
+
+        raw = result.stdout or ""
+        raw_lines = [ln for ln in raw.splitlines() if ln.strip()]
+
+        parsed: list[tuple[datetime | None, int, str]] = []
+        for idx, line in enumerate(raw_lines):
+            ts: datetime | None = None
+            if line.startswith("{") and line.endswith("}"):
+                try:
+                    obj = json.loads(line)
+                    asctime = obj.get("asctime")
+                    if isinstance(asctime, str):
+                        ts = datetime.strptime(asctime, "%Y-%m-%d %H:%M:%S")
+                except Exception:
+                    ts = None
+            parsed.append((ts, idx, line))
+
+        parsed.sort(key=lambda x: (x[0] is None, x[0] or datetime.min, x[1]))
+        sorted_lines = [x[2] for x in parsed]
+        if len(sorted_lines) > lines:
+            sorted_lines = sorted_lines[-lines:]
+
+        return "\n".join(sorted_lines) + ("\n" if sorted_lines else "")
diff --git a/backend/apps/common/urls.py b/backend/apps/common/urls.py
index 65d4cfde..afcb2114 100644
--- a/backend/apps/common/urls.py
+++ b/backend/apps/common/urls.py
@@ -2,11 +2,12 @@
 通用模块 URL 配置
 """
 from django.urls import path
-from .views import LoginView, LogoutView, MeView, ChangePasswordView
+from .views import LoginView, LogoutView, MeView, ChangePasswordView, SystemLogsView
 
 urlpatterns = [
     path('auth/login/', LoginView.as_view(), name='auth-login'),
     path('auth/logout/', LogoutView.as_view(), name='auth-logout'),
     path('auth/me/', MeView.as_view(), name='auth-me'),
     path('auth/change-password/', ChangePasswordView.as_view(), name='auth-change-password'),
+    path('system/logs/', SystemLogsView.as_view(), name='system-logs'),
 ]
diff --git a/backend/apps/common/views/__init__.py b/backend/apps/common/views/__init__.py
index 05115be3..1c5fc296 100644
--- a/backend/apps/common/views/__init__.py
+++ b/backend/apps/common/views/__init__.py
@@ -1,3 +1,4 @@
 from .auth_views import LoginView, LogoutView, MeView, ChangePasswordView
+from .system_log_views import SystemLogsView
 
-__all__ = ['LoginView', 'LogoutView', 'MeView', 'ChangePasswordView']
+__all__ = ['LoginView', 'LogoutView', 'MeView', 'ChangePasswordView', 'SystemLogsView']
diff --git a/backend/apps/common/views/system_log_views.py b/backend/apps/common/views/system_log_views.py
new file mode 100644
index 00000000..70e8da29
--- /dev/null
+++ b/backend/apps/common/views/system_log_views.py
@@ -0,0 +1,36 @@
+import logging
+
+from django.utils.decorators import method_decorator
+from django.views.decorators.csrf import csrf_exempt
+from rest_framework import status
+from rest_framework.permissions import AllowAny
+from rest_framework.response import Response
+from rest_framework.views import APIView
+
+from apps.common.services.system_log_service import SystemLogService
+
+
+logger = logging.getLogger(__name__)
+
+
+@method_decorator(csrf_exempt, name="dispatch")
+class SystemLogsView(APIView):
+    authentication_classes = []
+    permission_classes = [AllowAny]
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.service = SystemLogService()
+
+    def get(self, request):
+        try:
+            lines_raw = request.query_params.get("lines")
+            lines = int(lines_raw) if lines_raw is not None else None
+
+            content = self.service.get_logs_content(lines=lines)
+            return Response({"content": content})
+        except ValueError:
+            return Response({"error": "lines 参数必须是整数"}, status=status.HTTP_400_BAD_REQUEST)
+        except Exception:
+            logger.exception("获取系统日志失败")
+            return Response({"error": "获取系统日志失败"}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
diff --git a/docker/start.sh b/docker/start.sh
index 4943ef3a..b684fd76 100755
--- a/docker/start.sh
+++ b/docker/start.sh
@@ -85,38 +85,68 @@ export BUILDKIT_INLINE_CACHE=1
 # 使用指定的 compose 文件
 COMPOSE_ARGS="-f ${COMPOSE_FILE} ${PROFILE_ARG}"
 
+SERVICES="$(${COMPOSE_CMD} ${COMPOSE_ARGS} config --services)"
+service_exists() {
+    echo "$SERVICES" | grep -qx "$1"
+}
+
+BACKEND_SERVICES=()
+for s in redis server agent; do
+    if service_exists "$s"; then
+        BACKEND_SERVICES+=("$s")
+    fi
+done
+
+# 如果使用本地数据库，先启动 postgres 并等待健康
+start_postgres_first() {
+    if [ -n "$PROFILE_ARG" ]; then
+        echo -e "${CYAN}[DB]${NC} 启动 PostgreSQL 容器..."
+        ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d postgres
+        echo -e "${CYAN}[DB]${NC} 等待 PostgreSQL 就绪..."
+        local max_wait=30
+        local count=0
+        while [ $count -lt $max_wait ]; do
+            if ${COMPOSE_CMD} ${COMPOSE_ARGS} exec -T postgres pg_isready -U postgres >/dev/null 2>&1; then
+                echo -e "${GREEN}[DB]${NC} PostgreSQL 已就绪"
+                return 0
+            fi
+            sleep 1
+            count=$((count + 1))
+        done
+        echo -e "${YELLOW}[WARN]${NC} PostgreSQL 等待超时，继续启动其他服务..."
+    fi
+}
+
 echo ""
 if [ "$DEV_MODE" = true ]; then
     # 开发模式：本地构建
     if [ "$WITH_FRONTEND" = true ]; then
         echo -e "${CYAN}[BUILD]${NC} 并行构建镜像..."
         ${COMPOSE_CMD} ${COMPOSE_ARGS} build --parallel
+        start_postgres_first
         echo -e "${CYAN}[START]${NC} 启动全部服务..."
         ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d
     else
         echo -e "${CYAN}[BUILD]${NC} 并行构建后端镜像..."
-        ${COMPOSE_CMD} ${COMPOSE_ARGS} build --parallel server scan-worker maintenance-worker
+        ${COMPOSE_CMD} ${COMPOSE_ARGS} build --parallel "${BACKEND_SERVICES[@]}"
+        start_postgres_first
         echo -e "${CYAN}[START]${NC} 启动后端服务..."
-        ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d redis server scan-worker maintenance-worker
-        if [ -n "$PROFILE_ARG" ]; then
-            ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d postgres
-        fi
+        ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d "${BACKEND_SERVICES[@]}"
     fi
 else
     # 生产模式：拉取 Docker Hub 镜像
     if [ "$WITH_FRONTEND" = true ]; then
         echo -e "${CYAN}[PULL]${NC} 拉取最新镜像..."
         ${COMPOSE_CMD} ${COMPOSE_ARGS} pull
+        start_postgres_first
         echo -e "${CYAN}[START]${NC} 启动全部服务..."
         ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d
     else
         echo -e "${CYAN}[PULL]${NC} 拉取后端镜像..."
-        ${COMPOSE_CMD} ${COMPOSE_ARGS} pull redis server scan-worker maintenance-worker
+        ${COMPOSE_CMD} ${COMPOSE_ARGS} pull "${BACKEND_SERVICES[@]}"
+        start_postgres_first
         echo -e "${CYAN}[START]${NC} 启动后端服务..."
-        ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d redis server scan-worker maintenance-worker
-        if [ -n "$PROFILE_ARG" ]; then
-            ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d postgres
-        fi
+        ${COMPOSE_CMD} ${COMPOSE_ARGS} up -d "${BACKEND_SERVICES[@]}"
     fi
 fi
 echo -e "${GREEN}[OK]${NC} 服务已启动"
diff --git a/frontend/components/settings/system-logs/system-logs-view.tsx b/frontend/components/settings/system-logs/system-logs-view.tsx
index c5621def..9632fbf0 100644
--- a/frontend/components/settings/system-logs/system-logs-view.tsx
+++ b/frontend/components/settings/system-logs/system-logs-view.tsx
@@ -9,7 +9,7 @@ import { useSystemLogs } from "@/hooks/use-system-logs"
 
 export function SystemLogsView() {
   const { theme } = useTheme()
-  const { data } = useSystemLogs({ lines: 2000 })
+  const { data } = useSystemLogs({ lines: 200 })
 
   const content = useMemo(() => data?.content ?? "", [data?.content])
 
diff --git a/uninstall.sh b/uninstall.sh
index 323e37d3..01aff6bb 100755
--- a/uninstall.sh
+++ b/uninstall.sh
@@ -95,16 +95,17 @@ fi
 # ==============================================================================
 # 2. 删除扫描日志和结果目录
 # ==============================================================================
-LOGS_DIR="$ROOT_DIR/backend/logs"
-RESULTS_DIR="$ROOT_DIR/backend/results"
 
-step "[2/6] 是否删除扫描日志和结果目录 ($LOGS_DIR, $RESULTS_DIR)？(Y/n)"
+OPT_LOGS_DIR="/opt/xingrin/logs"
+OPT_RESULTS_DIR="/opt/xingrin/results"
+
+step "[2/6] 是否删除扫描日志和结果目录 ($OPT_LOGS_DIR, $OPT_RESULTS_DIR)？(Y/n)"
 read -r ans_logs
 ans_logs=${ans_logs:-Y}
 
 if [[ $ans_logs =~ ^[Yy]$ ]]; then
     info "正在删除日志和结果目录..."
-    rm -rf "$LOGS_DIR" "$RESULTS_DIR"
+    rm -rf "$OPT_LOGS_DIR" "$OPT_RESULTS_DIR"
     success "已删除日志和结果目录。"
 else
     warn "已保留日志和结果目录。"