diff --git a/modules/rpc/client/client.go b/modules/rpc/client/client.go
index a9c2b6e..86ca5ec 100644
--- a/modules/rpc/client/client.go
+++ b/modules/rpc/client/client.go
@@ -7,16 +7,21 @@ import (
     "time"
     "errors"
     "github.com/ouqiang/gocron/modules/rpc/grpcpool"
+    "google.golang.org/grpc/codes"
+    "google.golang.org/grpc"
 )
 
 func Exec(ip string, port int, taskReq *pb.TaskRequest) (string, error)  {
-    addr := fmt.Sprintf("%s:%d", ip, port);
+    addr := fmt.Sprintf("%s:%d", ip, port)
     conn, err := grpcpool.Pool.Get(addr)
     if err != nil {
         return "", err
     }
+    isConnClosed := false
     defer func() {
-        grpcpool.Pool.Put(addr, conn)
+        if !isConnClosed {
+            grpcpool.Pool.Put(addr, conn)
+        }
     }()
     c := pb.NewTaskClient(conn)
     if taskReq.Timeout <= 0 || taskReq.Timeout > 86400 {
@@ -27,7 +32,7 @@ func Exec(ip string, port int, taskReq *pb.TaskRequest) (string, error)  {
     defer cancel()
     resp, err := c.Run(ctx, taskReq)
     if err != nil {
-        return "", err
+       return parseGRPCError(err, conn, &isConnClosed)
     }
 
     if resp.Error == "" {
@@ -35,4 +40,16 @@ func Exec(ip string, port int, taskReq *pb.TaskRequest) (string, error)  {
     }
 
     return resp.Output, errors.New(resp.Error)
-}
\ No newline at end of file
+}
+
+func parseGRPCError(err error, conn *grpc.ClientConn, connClosed *bool) (string, error) {
+    switch grpc.Code(err) {
+        case codes.Unavailable:
+            conn.Close()
+            *connClosed = true
+            return "", errors.New("无法连接远程服务器")
+        case codes.DeadlineExceeded:
+            return "", errors.New("执行超时, 强制结束")
+    }
+    return "", err
+}