diff --git a/core.py b/core.py
index 02077d4..7ee0594 100644
--- a/core.py
+++ b/core.py
@@ -22,10 +22,6 @@ class MultiThreadDownload(threading.Thread):
 
 class GMCLCore(object):
     '''The Main Class of the Launcher Core'''
-    '''
-        self.__GamePath=GamePath
-        self.__Version=Version
-    '''
     def __init__(self,LauncherName="GMCLCore",LauncherVersion="A0.2.0",LogOutput=False):
         '''The global variable set function'''
         ''':LauncherName The name of your launcher,the default value is "GMCLCore"'''
@@ -36,6 +32,10 @@ class GMCLCore(object):
         self.__LogOutput=LogOutput
         self.__UserAgent={'User-Agent':LauncherName+'/'+LauncherVersion+' ((GMCL Core Alpha 0.2.0;Alpha))'}
         self.__Log=[]
+        self.__AuthWay=""
+        self.Log("info","Successful.","__init__")
+    def __del__(self):
+        self.Log("info","Successful.","__del__")
     def Log(self,Type,Text,Function="Anonymous Function",ErrorType="TypeError"):
         '''The function which was used to manager the log output system'''
         ''':Type Type of the log info'''
@@ -60,6 +60,14 @@ class GMCLCore(object):
             else:
                 self.__Log.append(("OTHER",time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()),Function,Text))
                 return ("OTHER",Text)
+    def ReturnLog(self):
+        '''The function which was used to return the list of program log'''
+        self.Log("info","Successful.","ReturnLog")
+        return self.__Log
+    def PrintLog(self):
+        '''The function which was used to print the list of program log'''
+        self.Log("info","Successful.","PrintLog")
+        print(self.__Log)
     def MakeDir(self,Path):
         '''The function which was used to create a dir with determination'''
         ''':Path The path of the dir you want to create'''
@@ -121,12 +129,12 @@ class GMCLCore(object):
                     self.__ID=result['selectedProfile']['name']
                     self.Log("info","Success.","GetAccount")
                 else:
-                    return Log("warn","Fail to request Mojang\'s auth server.","SetAccount")
+                    return self.Log("warn","Fail to request Mojang\'s auth server.","SetAccount")
             else:
-                return Log("warn","Wrong Account.","SetAccount")
+                return self.Log("warn","Wrong Account.","SetAccount")
         elif(self.__AuthWay=="offline"):
             if(Account.count("@")==1):
-                return Log("warn","Wrong Account.","SetAccount")
+                return self.Log("warn","Wrong Account.","SetAccount")
             else:
                 self.__ID=Account
                 self.__UUID=self.GetUUID(Account)
@@ -139,60 +147,66 @@ class GMCLCore(object):
         ''':AuthWay Your auth way,must be "offline" or "online"'''
         if(AuthWay=="offline"):
             self.__AuthWay="offline"
+            self.Log("info","Success.","SetAuthWay")
         elif(AuthWay=="online"):
             self.__AuthWay="online"
+            self.Log("info","Success.","SetAuthWay")
         else:
-            return "Error:Wrong Auth Way."
+            self.Log("warn","Wrong Auth Way.","SetAccount")
     def SetRecomMem(self):
         '''The recommendation memory value set function'''
         self.__Memory = float(psutil.virtual_memory().free / 1024 ** 3) * 0.8
+        self.Log("info","Success.","SetRecomMem")
     def SetJavaPath(self,path):
         '''The java path set function'''
         ''':Path Your java path'''
         if(path==None):
-            return "Error:Wrong local address for java."
+            self.Log("warn","Wrong local address for java.","SetJavaPath")
         else:
             if(os.path.exists(path)):
                 self.__JAVA=path
+                self.Log("info","Success.","SetJavaPath")
             else:
-                return "Error:Wrong local address for java."
+                self.Log("warn","Wrong local address for java.","SetJavaPath")
     def SetGameMem(self,Memory):
         '''The game memory value set function'''
         ''':Memory The memory of the game,the unit is GiBytes'''
         try:
             self.__Memory=float(Memory)
+            self.Log("info","Success.","SetGameMem")
         except:
-            return "Error:Wrong parameter for game memory."
+            self.Log("warn","Wrong parameter for game memory.","SetGameMem")
     def Download(self,DownloadFrom,DownloadTo,ThreadNum=3):
         '''The multi-thread download function'''
         ''':DownloadFrom The online url for the file'''
         ''':DownloadTo The local path for the file'''
         ''':ThreadNum The number of the thread,the default value is 3'''
         if(DownloadFrom=="" or DownloadTo==""):
-            return "Error:Wrong online address or local address for download."
+            self.Log("warn","Wrong online address or local address for download.","Download")
         else:
-            url = DownloadFrom
-            filename = DownloadTo
-            filesize = int(requests.head(url,headers=self.__UserAgent).headers['Content-Length'])
-            threadnum = ThreadNum
+            url=DownloadFrom
+            filename=DownloadTo
+            filesize=int(requests.head(url,headers=self.__UserAgent).headers['Content-Length'])
+            threadnum=ThreadNum
             threading.BoundedSemaphore(threadnum)
-            step = filesize // threadnum
-            mtd_list = []
-            start = 0
-            end = -1
-            tempf = open(filename,'w')
+            step=filesize // threadnum
+            mtd_list=[]
+            start=0
+            end=-1
+            tempf=open(filename,'w')
             tempf.close()
             with open(filename,'rb+') as  f:
-                fileno = f.fileno()
+                fileno=f.fileno()
                 while end < filesize -1:
-                    start = end +1
-                    end = start + step -1
+                    start=end +1
+                    end=start + step -1
                     if end > filesize:
-                        end = filesize
-                    dup = os.dup(fileno)
-                    fd = os.fdopen(dup,'rb+',-1)
-                    t = MultiThreadDownload(url,start,end,fd,self.__UserAgent)
+                        end=filesize
+                    dup=os.dup(fileno)
+                    fd=os.fdopen(dup,'rb+',-1)
+                    t=MultiThreadDownload(url,start,end,fd,self.__UserAgent)
                     t.start()
                     mtd_list.append(t)
                 for i in mtd_list:
-                    i.join()
\ No newline at end of file
+                    i.join()
+            self.Log("info","Success.","Download")