diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/DownloadTarget.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/DownloadTarget.java
index 7b23b076..e3cba753 100644
--- a/downloadutil/src/main/java/com/arialyy/downloadutil/core/DownloadTarget.java
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/DownloadTarget.java
@@ -95,6 +95,7 @@ public class DownloadTarget extends IDownloadTarget {
         if (task == null) {
             task = mExecutePool.getTask(downloadUrl);
         }
+
         return task;
     }
 
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/AddCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/AddCommand.java
index 4fe33bb4..30c9a732 100644
--- a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/AddCommand.java
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/AddCommand.java
@@ -1,5 +1,7 @@
 package com.arialyy.downloadutil.core.command;
 
+import android.support.annotation.NonNull;
+
 import com.arialyy.downloadutil.core.IDownloadTarget;
 
 /**
@@ -7,12 +9,22 @@ import com.arialyy.downloadutil.core.IDownloadTarget;
  * 添加任务的命令
  */
 public class AddCommand extends IDownloadCommand {
-    public AddCommand(IDownloadTarget target) {
+    String mDownloadUrl, mDownloadPath;
+
+    /**
+     *
+     * @param target        下载调度器
+     * @param downloadUrl   下载链接
+     * @param downloadPath  文件保存地址
+     */
+    public AddCommand(@NonNull IDownloadTarget target, String downloadUrl, String downloadPath) {
         super(target);
+        mDownloadUrl = downloadUrl;
+        mDownloadPath = downloadPath;
     }
 
     @Override
     public void executeComment() {
-
+        target.createTask(mDownloadUrl, mDownloadPath);
     }
 }
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/CancelCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/CancelCommand.java
new file mode 100644
index 00000000..2cd79a89
--- /dev/null
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/CancelCommand.java
@@ -0,0 +1,18 @@
+package com.arialyy.downloadutil.core.command;
+
+import com.arialyy.downloadutil.core.IDownloadTarget;
+
+/**
+ * Created by lyy on 2016/9/20.
+ * 取消命令
+ */
+public class CancelCommand extends IDownloadCommand{
+    public CancelCommand(IDownloadTarget target) {
+        super(target);
+    }
+
+    @Override
+    public void executeComment() {
+
+    }
+}
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/GetStateCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/GetStateCommand.java
new file mode 100644
index 00000000..dc46380d
--- /dev/null
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/GetStateCommand.java
@@ -0,0 +1,18 @@
+package com.arialyy.downloadutil.core.command;
+
+import com.arialyy.downloadutil.core.IDownloadTarget;
+
+/**
+ * Created by lyy on 2016/9/20.
+ * 获取下载状态的命令
+ */
+public class GetStateCommand extends IDownloadCommand {
+    public GetStateCommand(IDownloadTarget target) {
+        super(target);
+    }
+
+    @Override
+    public void executeComment() {
+
+    }
+}
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/IDownloadCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/IDownloadCommand.java
index 5a04c40b..d96c6d4c 100644
--- a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/IDownloadCommand.java
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/IDownloadCommand.java
@@ -1,5 +1,7 @@
 package com.arialyy.downloadutil.core.command;
 
+import android.support.annotation.NonNull;
+
 import com.arialyy.downloadutil.core.DownloadTarget;
 import com.arialyy.downloadutil.core.IDownloadTarget;
 
@@ -10,9 +12,9 @@ import java.util.List;
  * 下载命令
  */
 public abstract class IDownloadCommand {
-    private IDownloadTarget target;
+    protected IDownloadTarget target;
 
-    public IDownloadCommand(IDownloadTarget target) {
+    public IDownloadCommand(@NonNull IDownloadTarget target) {
         this.target = target;
     }
 
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StartCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StartCommand.java
index 2892eaed..f06991ed 100644
--- a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StartCommand.java
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StartCommand.java
@@ -1,18 +1,21 @@
 package com.arialyy.downloadutil.core.command;
 
+import android.support.annotation.NonNull;
+
 import com.arialyy.downloadutil.core.IDownloadTarget;
+import com.arialyy.downloadutil.core.Task;
 
 /**
  * Created by lyy on 2016/8/22.
  * 开始命令
  */
 public class StartCommand extends IDownloadCommand{
-    public StartCommand(IDownloadTarget target) {
+    public StartCommand(@NonNull IDownloadTarget target) {
         super(target);
     }
 
     @Override
     public void executeComment() {
-
+//        target.startTask();
     }
 }
diff --git a/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StopCommand.java b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StopCommand.java
new file mode 100644
index 00000000..216607ca
--- /dev/null
+++ b/downloadutil/src/main/java/com/arialyy/downloadutil/core/command/StopCommand.java
@@ -0,0 +1,18 @@
+package com.arialyy.downloadutil.core.command;
+
+import com.arialyy.downloadutil.core.IDownloadTarget;
+
+/**
+ * Created by lyy on 2016/9/20.
+ * 停止命令
+ */
+public class StopCommand extends IDownloadCommand {
+    public StopCommand(IDownloadTarget target) {
+        super(target);
+    }
+
+    @Override
+    public void executeComment() {
+
+    }
+}