diff --git a/.gitignore b/.gitignore
index 902b2fe..d43c963 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,7 +15,9 @@ chrome-profiler-events.json
 speed-measure-plugin.json
 
 # IDEs and editors
-/.idea
+/.idea/*
+/backend/.idea/*
+.directory
 .project
 .classpath
 .c9/
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 050eee1..f5c1e4e 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,12 +2,11 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="2a27c0ce-fe61-45a2-8044-562a85d08921" name="Default Changelist" comment="">
+      <change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README.md" beforeDir="false" afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/README_zh.md" beforeDir="false" afterPath="$PROJECT_DIR$/README_zh.md" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/backend/engine/engineTorrent.go" beforeDir="false" afterPath="$PROJECT_DIR$/backend/engine/engineTorrent.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/main.js" beforeDir="false" afterPath="$PROJECT_DIR$/main.js" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/main.js.map" beforeDir="false" afterPath="$PROJECT_DIR$/main.js.map" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/package.json" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
@@ -32,21 +31,48 @@
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/package.json">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="315">
+            <state relative-caret-position="-847">
               <caret line="36" column="57" selection-start-line="36" selection-start-column="57" selection-end-line="36" selection-end-column="57" />
             </state>
           </provider>
         </entry>
       </file>
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/.gitignore">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="210">
+              <caret line="18" column="16" selection-start-line="18" selection-start-column="16" selection-end-line="18" selection-end-column="16" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/backend/engine/engineTorrent.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="7000">
+              <caret line="200" column="29" selection-start-line="200" selection-start-column="29" selection-end-line="200" selection-end-column="29" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/backend/engine/info.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="4655">
+              <caret line="133" column="30" selection-start-line="133" selection-start-column="30" selection-end-line="133" selection-end-column="30" />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/README.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="210">
-                <caret line="48" column="18" selection-start-line="48" selection-start-column="18" selection-end-line="48" selection-end-column="18" />
+              <first_editor relative-caret-position="1225">
+                <caret line="35" column="49" selection-start-line="35" selection-start-column="49" selection-end-line="35" selection-end-column="49" />
               </first_editor>
               <second_editor />
             </state>
@@ -57,8 +83,8 @@
         <entry file="file://$PROJECT_DIR$/README_zh.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="601">
-                <caret line="34" column="2" selection-start-line="34" selection-start-column="2" selection-end-line="34" selection-end-column="2" />
+              <first_editor relative-caret-position="1225">
+                <caret line="35" selection-start-line="35" selection-end-line="35" selection-end-column="49" />
               </first_editor>
               <second_editor />
             </state>
@@ -178,7 +204,6 @@
         <option value="$PROJECT_DIR$/.travis.yml" />
         <option value="$PROJECT_DIR$/backend/README.md" />
         <option value="$PROJECT_DIR$/buildengine.js" />
-        <option value="$PROJECT_DIR$/.gitignore" />
         <option value="$PROJECT_DIR$/angular.json" />
         <option value="$PROJECT_DIR$/CHANGELOG.md" />
         <option value="$PROJECT_DIR$/electron-builder.json" />
@@ -191,14 +216,15 @@
         <option value="$PROJECT_DIR$/README_zh.md" />
         <option value="$PROJECT_DIR$/README.md" />
         <option value="$PROJECT_DIR$/package.json" />
+        <option value="$PROJECT_DIR$/.gitignore" />
       </list>
     </option>
   </component>
   <component name="ProjectFrameBounds">
-    <option name="x" value="761" />
-    <option name="y" value="253" />
-    <option name="width" value="1626" />
-    <option name="height" value="912" />
+    <option name="x" value="601" />
+    <option name="y" value="516" />
+    <option name="width" value="1272" />
+    <option name="height" value="686" />
   </component>
   <component name="ProjectLevelVcsManager" settingsEditedManually="true">
     <ConfirmationsSetting value="2" id="Add" />
@@ -208,7 +234,6 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
-      <pane id="Scope" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -216,27 +241,11 @@
               <item name="ant" type="b2602c69:ProjectViewProjectNode" />
               <item name="ant" type="462c0819:PsiDirectoryNode" />
             </path>
-            <path>
-              <item name="ant" type="b2602c69:ProjectViewProjectNode" />
-              <item name="ant" type="462c0819:PsiDirectoryNode" />
-              <item name="backend" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="ant" type="b2602c69:ProjectViewProjectNode" />
-              <item name="ant" type="462c0819:PsiDirectoryNode" />
-              <item name="backend" type="462c0819:PsiDirectoryNode" />
-              <item name="engine" type="462c0819:PsiDirectoryNode" />
-            </path>
-            <path>
-              <item name="ant" type="b2602c69:ProjectViewProjectNode" />
-              <item name="ant" type="462c0819:PsiDirectoryNode" />
-              <item name="backend" type="462c0819:PsiDirectoryNode" />
-              <item name="router" type="462c0819:PsiDirectoryNode" />
-            </path>
           </expand>
           <select />
         </subPane>
       </pane>
+      <pane id="Scope" />
     </panes>
   </component>
   <component name="PropertiesComponent">
@@ -372,11 +381,14 @@
       <workItem from="1554957227568" duration="8106000" />
       <workItem from="1554969142576" duration="185000" />
       <workItem from="1554971492777" duration="559000" />
+      <workItem from="1554973355686" duration="155000" />
+      <workItem from="1554973549199" duration="21000" />
+      <workItem from="1554973600850" duration="116000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="128670000" />
+    <option name="totallyTimeSpent" value="128962000" />
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -388,10 +400,10 @@
     </todo-panel>
   </component>
   <component name="ToolWindowManager">
-    <frame x="-4" y="272" width="1626" height="912" extended-state="0" />
+    <frame x="601" y="516" width="1272" height="686" extended-state="0" />
     <editor active="true" />
     <layout>
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.23573668" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.30378726" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Favorites" order="2" side_tool="true" />
       <window_info id="npm" order="3" side_tool="true" />
@@ -406,7 +418,7 @@
       <window_info anchor="bottom" id="Database Changes" order="8" />
       <window_info anchor="bottom" id="Version Control" order="9" weight="0.3296582" />
       <window_info anchor="bottom" id="Terminal" order="10" weight="0.32792208" />
-      <window_info anchor="bottom" id="Event Log" order="11" sideWeight="0.5009346" side_tool="true" visible="true" weight="0.20104438" />
+      <window_info anchor="bottom" id="Event Log" order="11" sideWeight="0.5009346" side_tool="true" visible="true" weight="0.28333333" />
       <window_info anchor="bottom" id="TypeScript" order="12" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
@@ -468,13 +480,6 @@
     <proxy>http://127.0.0.1:7777/</proxy>
   </component>
   <component name="editorHistoryManager">
-    <entry file="file://$PROJECT_DIR$/src/app/components/messages/messages.component.scss">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="245">
-          <caret line="7" selection-start-line="7" selection-end-line="7" />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/src/app/providers/messages.service.ts">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="327">
@@ -616,13 +621,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/.gitignore">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="315">
-          <caret line="24" lean-forward="true" selection-start-line="24" selection-end-line="24" />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/buildengine.js">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="373">
@@ -765,54 +763,68 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/main.ts">
+    <entry file="file://$PROJECT_DIR$/backend/engine/engine.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1855">
-          <caret line="58" column="39" selection-start-line="58" selection-start-column="39" selection-end-line="58" selection-end-column="39" />
-          <folding>
-            <element signature="e#0#88#0" expanded="true" />
-          </folding>
+        <state relative-caret-position="626">
+          <caret line="100" column="5" selection-start-line="100" selection-start-column="5" selection-end-line="100" selection-end-column="5" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/package.json">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-847">
+          <caret line="36" column="57" selection-start-line="36" selection-start-column="57" selection-end-line="36" selection-end-column="57" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/backend/engine/engineTorrent.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1151">
-          <caret line="130" selection-start-line="130" selection-end-line="130" />
+        <state relative-caret-position="7000">
+          <caret line="200" column="29" selection-start-line="200" selection-start-column="29" selection-end-line="200" selection-end-column="29" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/backend/engine/engine.go">
+    <entry file="file://$PROJECT_DIR$/backend/engine/info.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="626">
-          <caret line="100" column="5" selection-start-line="100" selection-start-column="5" selection-end-line="100" selection-end-column="5" />
+        <state relative-caret-position="4655">
+          <caret line="133" column="30" selection-start-line="133" selection-start-column="30" selection-end-line="133" selection-end-column="30" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/README_zh.md">
+    <entry file="file://$PROJECT_DIR$/README.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="601">
-            <caret line="34" column="2" selection-start-line="34" selection-start-column="2" selection-end-line="34" selection-end-column="2" />
+          <first_editor relative-caret-position="1225">
+            <caret line="35" column="49" selection-start-line="35" selection-start-column="49" selection-end-line="35" selection-end-column="49" />
           </first_editor>
           <second_editor />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/README.md">
+    <entry file="file://$PROJECT_DIR$/README_zh.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="210">
-            <caret line="48" column="18" selection-start-line="48" selection-start-column="18" selection-end-line="48" selection-end-column="18" />
+          <first_editor relative-caret-position="1225">
+            <caret line="35" selection-start-line="35" selection-end-line="35" selection-end-column="49" />
           </first_editor>
           <second_editor />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/package.json">
+    <entry file="file://$PROJECT_DIR$/main.ts">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="315">
-          <caret line="36" column="57" selection-start-line="36" selection-start-column="57" selection-end-line="36" selection-end-column="57" />
+        <state relative-caret-position="1855">
+          <caret line="58" column="39" selection-start-line="58" selection-start-column="39" selection-end-line="58" selection-end-column="39" />
+          <folding>
+            <element signature="e#0#88#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/.gitignore">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="210">
+          <caret line="18" column="16" selection-start-line="18" selection-start-column="16" selection-end-line="18" selection-end-column="16" />
         </state>
       </provider>
     </entry>
diff --git a/README.md b/README.md
index 08bbe43..79ff6ef 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ If you like this application, please consider give a star for this project.
 
 ## TODO List
 - Add support for network speed limit
+- Add support for maximum number of download task
 
 ## Architecture:
 ![](./src/assets/READEME/architecture.jpg)
@@ -46,8 +47,6 @@ If you like this application, please consider give a star for this project.
 ![](./src/assets/READEME/steaming.png)
 --------------
 
-## Download Mirror
-
 ## Get Started
 
 You can download packaged binary file directly from [Release](https://github.com/anatasluo/ant/releases)
diff --git a/README_zh.md b/README_zh.md
index 4785571..e5dcf11 100644
--- a/README_zh.md
+++ b/README_zh.md
@@ -33,6 +33,7 @@
 
 ## TODO List
 - Add support for network speed limit
+- Add support for maximum number of download task
 
 ## 项目架构:
 ![](./src/assets/READEME/architecture.jpg)
diff --git a/backend/engine/engineTorrent.go b/backend/engine/engineTorrent.go
index 1847124..bcc5fac 100644
--- a/backend/engine/engineTorrent.go
+++ b/backend/engine/engineTorrent.go
@@ -76,8 +76,8 @@ func (engine *Engine)AddOneTorrentFromMagnet (linkAddress string)(tmpTorrent *to
 						}else{
 							logger.Debug("Add torrent from magnet")
 							engine.EngineRunningInfo.UpdateMagnetInfo(tmpTorrent)
-							engine.SaveInfo()
 							engine.GenerateInfoFromTorrent(tmpTorrent)
+							engine.SaveInfo()
 							engine.StartDownloadTorrent(tmpTorrent.InfoHash().HexString())
 							engine.EngineRunningInfo.EngineCMD <- RefreshInfo
 							logger.Debug("It should refresh")
@@ -128,7 +128,6 @@ func (engine *Engine)StartDownloadTorrent(hexString string)(downloaded bool) {
 		singleTorrentLog, _ := engine.EngineRunningInfo.HashToTorrentLog[singleTorrent.InfoHash()]
 		if singleTorrentLog.Status != RunningStatus {
 			singleTorrentLog.Status = RunningStatus
-			engine.SaveInfo()
 			//check if extend exist
 			_, extendIsExist := engine.EngineRunningInfo.TorrentLogExtends[singleTorrent.InfoHash()];
 			if !extendIsExist {
@@ -200,6 +199,7 @@ func (engine *Engine)StopOneTorrent(hexString string)(stopped bool) {
 		singleTorrentLog, _:= engine.EngineRunningInfo.HashToTorrentLog[singleTorrent.InfoHash()]
 		if singleTorrentLog.Status != CompletedStatus {
 			singleTorrentLog.Status = StoppedStatus
+			engine.SaveInfo()
 			//engine.EngineRunningInfo.UpdateTorrentLog()
 			singleTorrentLogExtend, extendExist := engine.EngineRunningInfo.TorrentLogExtends[singleTorrent.InfoHash()]
 			if extendExist && singleTorrentLogExtend.HasStatusPub && singleTorrentLogExtend.StatusPub != nil {
diff --git a/package.json b/package.json
index 943cd1c..4fd4095 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ant-downloader",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "description": "",
   "homepage": "https://github.com/anatasluo/ant",
   "repository": {