diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/DownloadEntity.java b/Aria/src/main/java/com/arialyy/aria/core/download/DownloadEntity.java
index f97bf1b7..ef4769eb 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/DownloadEntity.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/DownloadEntity.java
@@ -18,9 +18,11 @@ package com.arialyy.aria.core.download;
 
 import android.os.Parcel;
 import android.os.Parcelable;
+import android.text.TextUtils;
 import com.arialyy.aria.core.inf.AbsNormalEntity;
 import com.arialyy.aria.core.inf.AbsTaskEntity;
 import com.arialyy.aria.orm.Primary;
+import com.arialyy.aria.util.CommonUtil;
 
 /**
  * Created by lyy on 2015/12/25.
@@ -66,7 +68,7 @@ public class DownloadEntity extends AbsNormalEntity implements Parcelable {
   }
 
   public String getDisposition() {
-    return disposition;
+    return TextUtils.isEmpty(disposition) ? "" : CommonUtil.decryptBASE64(disposition);
   }
 
   public void setDisposition(String disposition) {
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/DownloadTarget.java b/Aria/src/main/java/com/arialyy/aria/core/download/DownloadTarget.java
index 3d41df0c..16978e96 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/DownloadTarget.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/DownloadTarget.java
@@ -31,6 +31,7 @@ import java.io.File;
 public class DownloadTarget
     extends AbsDownloadTarget<DownloadTarget, DownloadEntity, DownloadTaskEntity> {
   protected String url;
+
   DownloadTarget(DownloadEntity entity, String targetName) {
     this(entity.getUrl(), targetName);
   }
@@ -88,7 +89,6 @@ public class DownloadTarget
     super.setHighestPriority();
   }
 
-
   /**
    * 下载任务是否存在
    */
@@ -126,10 +126,17 @@ public class DownloadTarget
     return this;
   }
 
-  private DownloadEntity getDownloadEntity() {
+  public DownloadEntity getDownloadEntity() {
     return mEntity;
   }
 
+  /**
+   * 从header中获取文件描述信息
+   */
+  public String getContentDisposition() {
+    return mEntity.getDisposition();
+  }
+
   /**
    * 是否在下载
    */
diff --git a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpFileInfoThread.java b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpFileInfoThread.java
index 275000eb..51ce3611 100644
--- a/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpFileInfoThread.java
+++ b/Aria/src/main/java/com/arialyy/aria/core/download/downloader/HttpFileInfoThread.java
@@ -84,7 +84,7 @@ class HttpFileInfoThread implements Runnable {
     String disposition = conn.getHeaderField(mTaskEntity.dispositionKey);
     //Map<String, List<String>> headers = conn.getHeaderFields();
     if (!TextUtils.isEmpty(disposition)) {
-      mEntity.setDisposition(disposition);
+      mEntity.setDisposition(CommonUtil.encryptBASE64(disposition));
       if (disposition.contains(mTaskEntity.dispositionFileKey)) {
         String[] infos = disposition.split("=");
         mEntity.setServerFileName(URLDecoder.decode(infos[1], "utf-8"));
diff --git a/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java b/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
index 3e6b6e54..2f4fb2b4 100644
--- a/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
+++ b/Aria/src/main/java/com/arialyy/aria/util/CommonUtil.java
@@ -21,6 +21,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.text.TextUtils;
+import android.util.Base64;
 import android.util.Log;
 import com.arialyy.aria.core.AriaManager;
 import com.arialyy.aria.core.command.normal.NormalCmdFactory;
@@ -45,7 +46,6 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -64,6 +64,26 @@ import java.lang.reflect.WildcardType;
 public class CommonUtil {
   private static final String TAG = "CommonUtil";
 
+  /**
+   * base64 解密字符串
+   *
+   * @param str 被加密的字符串
+   * @return 解密后的字符串
+   */
+  public static String decryptBASE64(String str) {
+    return new String(Base64.decode(str.getBytes(), Base64.DEFAULT));
+  }
+
+  /**
+   * base64 加密字符串
+   *
+   * @param str 需要加密的字符串
+   * @return 加密后的字符串
+   */
+  public static String encryptBASE64(String str) {
+    return Base64.encodeToString(str.getBytes(), Base64.DEFAULT);
+  }
+
   /**
    * 字符串编码转换
    */
diff --git a/app/src/main/java/com/arialyy/simple/download/SingleTaskActivity.java b/app/src/main/java/com/arialyy/simple/download/SingleTaskActivity.java
index d4be9dee..f6fd0fdd 100644
--- a/app/src/main/java/com/arialyy/simple/download/SingleTaskActivity.java
+++ b/app/src/main/java/com/arialyy/simple/download/SingleTaskActivity.java
@@ -43,7 +43,8 @@ public class SingleTaskActivity extends BaseActivity<ActivitySingleBinding> {
       //"http://kotlinlang.org/docs/kotlin-docs.pdf";
       //"https://atom-installer.github.com/v1.13.0/AtomSetup.exe?s=1484074138&ext=.exe";
       //"http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
-      "http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
+      //"http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
+      "http://op08k4l50.bkt.clouddn.com/123.mp4";
   //"http://down2.xiaoshuofuwuqi.com/d/file/filetxt/20170608/14/%BA%DA%CE%D7%CA%A6%E1%C8%C6%F0.txt";
   //"http://tinghuaapp.oss-cn-shanghai.aliyuncs.com/20170612201739607815";
   //"http://static.gaoshouyou.com/d/36/69/2d3699acfa69e9632262442c46516ad8.apk";