diff --git a/app/src/main/java/com/navinfo/outdoor/api/Constant.java b/app/src/main/java/com/navinfo/outdoor/api/Constant.java
index 985ecfe..19f3350 100644
--- a/app/src/main/java/com/navinfo/outdoor/api/Constant.java
+++ b/app/src/main/java/com/navinfo/outdoor/api/Constant.java
@@ -36,7 +36,8 @@ public class Constant {
     public static final String GET_ERR_MESSAGE3 = "自动加载libtencentloc.so失败";
 
 
-    public static String BASE_FOLDER = SdkFolderCreate.getSDPath() + "/navinfoOutDoor";
+    public static final String ROOT_FOLDER = SdkFolderCreate.getSDPath() + "/navinfoOutDoor";
+    public static String BASE_FOLDER = ROOT_FOLDER;
     // 保存图片的目录
     public static String PICTURE_FOLDER;
 
@@ -45,11 +46,11 @@ public class Constant {
     public static String SHARED_PREFERENCES = "navInfo";
     public static String DATA_FILE = "dataFile";
     //下载文件
-    public static final String NABISCO_APk = BASE_FOLDER + "/apk/";
+    public static final String NABISCO_APk = ROOT_FOLDER + "/apk/";
     public static int  TelLength=0;
 
     public static void initRootFolder(String userId) {
-        BASE_FOLDER += "/" + userId;
+        BASE_FOLDER = ROOT_FOLDER +"/" + userId;
         PICTURE_FOLDER = BASE_FOLDER + "/picture";
         POI_DAO = BASE_FOLDER + "/BaseDao/";
         VIDEOS_ = BASE_FOLDER + "/videos";