diff --git a/src/main/java/org/csource/fastdfs/StorageClient.java b/src/main/java/org/csource/fastdfs/StorageClient.java
index dec5b1b..0d3fae8 100644
--- a/src/main/java/org/csource/fastdfs/StorageClient.java
+++ b/src/main/java/org/csource/fastdfs/StorageClient.java
@@ -1748,6 +1748,14 @@ public class StorageClient {
     this.storageServer.getSocket().getOutputStream().write(wholePkg);
   }
 
+  public boolean isConnected(){
+    return trackerServer.isConnected();
+  }
+
+  public boolean isAvaliable(){
+    return trackerServer.isAvaliable();
+  }
+
   /**
    * Upload file by file buff
    *
diff --git a/src/main/java/org/csource/fastdfs/TrackerServer.java b/src/main/java/org/csource/fastdfs/TrackerServer.java
index dffdb33..4b7dfd3 100644
--- a/src/main/java/org/csource/fastdfs/TrackerServer.java
+++ b/src/main/java/org/csource/fastdfs/TrackerServer.java
@@ -78,4 +78,36 @@ public class TrackerServer {
   protected void finalize() throws Throwable {
     this.close();
   }
+
+  public boolean isConnected(){
+    boolean isConnected = false;
+    if (sock != null){
+      if (sock.isConnected()){
+        isConnected = true;
+      }
+    }
+    return isConnected;
+  }
+
+  public boolean isAvaliable(){
+    if(isConnected()){
+      if(sock.getPort() == 0){
+        return false;
+      }
+      if(sock.getInetAddress() == null){
+        return false;
+      }
+      if(sock.getRemoteSocketAddress() == null){
+        return false;
+      }
+      if(sock.isInputShutdown()){
+        return false;
+      }
+      if(sock.isOutputShutdown()){
+        return false;
+      }
+      return true;
+    }
+    return false;
+  }
 }
diff --git a/src/test/java/org/csource/fastdfs/FdfsTest.java b/src/test/java/org/csource/fastdfs/FdfsTest.java
index fc3eea8..76645e9 100644
--- a/src/test/java/org/csource/fastdfs/FdfsTest.java
+++ b/src/test/java/org/csource/fastdfs/FdfsTest.java
@@ -36,20 +36,20 @@ public class FdfsTest {
         storageClient = new StorageClient(trackerServer, storageServer);
     }
 
-    @After
-    public void closeClient() {
-        LOGGER.info("close connection");
-        if(trackerServer != null){
-            try {
-                trackerServer.close();
-                trackerServer.finalize();
-            }catch (Exception e){
-                e.printStackTrace();
-            }catch (Throwable e){
-                e.printStackTrace();
-            }
-        }
-    }
+//    @After
+//    public void closeClient() {
+//        LOGGER.info("close connection");
+//        if(trackerServer != null){
+//            try {
+//                trackerServer.close();
+//                trackerServer.finalize();
+//            }catch (Exception e){
+//                e.printStackTrace();
+//            }catch (Throwable e){
+//                e.printStackTrace();
+//            }
+//        }
+//    }
 
     public void writeByteToFile(byte[] fbyte, String fileName) throws IOException {
         BufferedOutputStream bos = null;
@@ -96,4 +96,25 @@ public class FdfsTest {
         Assert.assertTrue(file.isFile());
     }
 
+    @Test
+    public void testUploadDownload() throws Exception {
+        NameValuePair[] metaList = new NameValuePair[1];
+        String local_filename = "build.PNG";
+        metaList[0] = new NameValuePair("fileName", local_filename);
+        File file = new File("C:/Users/chengdu/Desktop/build.PNG");
+        InputStream inputStream = new FileInputStream(file);
+        int length = inputStream.available();
+        byte[] bytes = new byte[length];
+        inputStream.read(bytes);
+        String[] result = storageClient.upload_file(bytes, null, metaList);
+        Assert.assertTrue(storageClient.isConnected());
+        // pool testOnborrow  isAvaliable
+        Assert.assertTrue(storageClient.isAvaliable());
+        LOGGER.info("result {}", Arrays.asList(result));
+        byte[] resultbytes = storageClient.download_file(result[0], result[1]);
+        writeByteToFile(resultbytes, local_filename);
+        File downfile = new File(local_filename);
+        Assert.assertTrue(downfile.isFile());
+    }
+
 }