diff --git a/config/config.json b/config/config.json
index 5f1d888..74ad9c2 100644
--- a/config/config.json
+++ b/config/config.json
@@ -416,7 +416,7 @@
              "base_station_color": "#1677ff",
              "aircraft_pixel_size": 50,
              "base_station_pixel_size": 100,
-             "aircraft_scale": 2.000000,
+             "aircraft_scale": 1.000000,
              "base_station_scale": 0.440000,
              "show_icao": true,
              "show_call_sign": false,
diff --git a/module/Local_Server/Data_Source/Database.cpp b/module/Local_Server/Data_Source/Database.cpp
index d135361..3bade17 100644
--- a/module/Local_Server/Data_Source/Database.cpp
+++ b/module/Local_Server/Data_Source/Database.cpp
@@ -50,6 +50,42 @@ Psc::JSON track_orientation_json_from_points(const SSR::Position_Info &first,
   ret.append({"roll", 0.0});
   return ret;
 }
+Psc::JSON empty_aircraft_track_json(std::string_view data_source_key,
+                                    std::string_view icao,
+                                    std::size_t last_size) {
+  auto ret = Psc::JSON::object();
+  ret.append({"icao", icao});
+  ret.append({"ds", data_source_key});
+  ret.append({"sta_seq", last_size});
+  ret.append({"end_seq", last_size});
+  ret.append({"size", 0});
+  ret.append({"list", Psc::JSON::array()});
+  return ret;
+}
+Psc::JSON aircraft_track_json(DataBase *db,
+                              std::string_view data_source_key,
+                              std::string_view icao,
+                              std::size_t last_size,
+                              bool include_empty) {
+  auto aircraft = db->get_aircraft(icao);
+  if (aircraft == nullptr) {
+    return include_empty ? empty_aircraft_track_json(data_source_key, icao,
+                                                     last_size) :
+                           Psc::JSON();
+  }
+  auto ret = aircraft->air_pos_track_list.get_last_array_json(last_size);
+  auto last_two = aircraft->air_pos_track_list.last_two();
+  if (last_two.has_value()) {
+    ret.children.insert(
+        ret.children.begin(),
+        Psc::JSON("track_orientation",
+                  track_orientation_json_from_points(last_two->first,
+                                                     last_two->second)));
+  }
+  ret.children.insert(ret.children.begin(), Psc::JSON("ds", data_source_key));
+  ret.children.insert(ret.children.begin(), Psc::JSON("icao", icao));
+  return ret;
+}
 }
 Aircraft::Aircraft(std::string_view icao) : Aircraft_Info(icao) {
   auto size = Global::instance()->mode_acs.max_track_point_size.load();
@@ -291,22 +327,28 @@ void database_server(Global *g) {
     CHECK_JSON_PARAM
     _init_db HTTP_REQUIRE_VALUE(icao, params.try_get_string("icao"))
         HTTP_REQUIRE_VALUE(last_size, params.try_get_number<std::size_t>(
-                                          "last_size")) auto aircraft =
-            db->get_aircraft(icao);
-    JSON ret;
-    if (aircraft != nullptr) {
-      ret = aircraft->air_pos_track_list.get_last_array_json(last_size);
-      auto last_two = aircraft->air_pos_track_list.last_two();
-      if (last_two.has_value()) {
-        ret.children.insert(
-            ret.children.begin(),
-            JSON("track_orientation",
-                 track_orientation_json_from_points(last_two->first,
-                                                    last_two->second)));
-      }
-      ret.children.insert(ret.children.begin(), JSON("ds", data_source_key));
-      ret.children.insert(ret.children.begin(), JSON("icao", icao));
+                                          "last_size")) auto ret =
+            aircraft_track_json(db.get(), data_source_key, icao, last_size,
+                                false);
+    res->setBody(ret.to_json_string());
+  });
+  svr.Post(api + "get_aircraft_track_list_batch", [](HTTP_Param) {
+    CHECK_JSON_PARAM
+    _init_db HTTP_REQUIRE_PTR(items, params.get("items"))
+        HTTP_REQUIRE_TRUE(items->valueType == Psc::Array, "items")
+    auto ret = JSON::object();
+    auto list = JSON::array();
+    for (const auto &item : items->children) {
+      HTTP_REQUIRE_TRUE(item.valueType == Psc::Object, "items")
+      HTTP_REQUIRE_VALUE(icao, item.try_get_string("icao"))
+      HTTP_REQUIRE_VALUE(last_size,
+                         item.try_get_number<std::size_t>("last_size"))
+      list.children.push_back(
+          aircraft_track_json(db.get(), data_source_key, icao, last_size,
+                              true));
     }
+    ret.append({"ds", data_source_key});
+    ret.append({"list", list});
     res->setBody(ret.to_json_string());
   });
   svr.Post(api + "get_aircraft_list_after", [](HTTP_Param) {
diff --git a/todolist.txt b/todolist.txt
index d43dc8e..a0ed27b 100644
--- a/todolist.txt
+++ b/todolist.txt
@@ -1,3 +1,6 @@
-网页显示的开启服务时间 同时得知系统的开机时间  系统的内存占用  cpu占用 线程的信息 显示在网页上
-先调研前端有什么图标库做这个事情
+
+
+1.  /aircraft_change_list 现在是全量列表，后面要改成基于版本号/时间戳的增量接口。  这个需求需要 cookie session机制
+实现需要前端返回 icao号状态 版本号吧  甚至可以实现 一个websoket 主动推送百脑汇
+