diff --git a/common/common.py b/common/common.py
index c173456b1de5af9bf754563053067696a072f57e..ba1baa7530b08fd3150c20223d7211bbd0d6e9b3 100644
--- a/common/common.py
+++ b/common/common.py
@@ -6,9 +6,83 @@ date: 2020-10-20 15:50
 function for all
 """
 
+import pexpect
+
 
 def str_to_bool(s):
     """
     change string to bool
     """
     return s.lower() in ("yes", "true", "t", "1")
+
+
+class Pexpect(object):
+    """
+    expect by python
+    """
+    def __init__(self, user, ip, passwd, port=None):
+        """
+        init connect message
+        user: user for system
+        ip: ip of the system
+        port: port for connectiong by sshd
+        """
+        self.user = user
+        self.ip = ip
+        self.passwd = passwd
+        self.port = port
+
+    def _expect(self, process):
+        for i in range(5):
+            ret=process.expect(["(yes/no)", "Password", "password", pexpect.EOF, \
+                    pexpect.exceptions.TIMEOUT], timeout=1)
+            print(ret)
+            if ret == 0:
+                process.sendline("yes\n")
+            if ret == 1 or ret == 2:
+                process.sendline("%s\n" % self.passwd)
+                break
+            if ret == 3 or ret == 4:
+                break
+
+    def ssh_cmd(self, cmd):
+        """
+        cmd: command will be runnd
+        return: response of command
+        """
+        if self.port:
+            cmd = "ssh -p %s %s@%s '%s'" % (self.port, self.user, self.ip, cmd)
+        else:
+            cmd = "ssh %s@%s '%s'" % (self.user, self.ip, cmd)
+        print(cmd)
+        process = pexpect.spawn(cmd)
+        self._expect(process)
+        msg = process.readlines()
+        process.close()
+
+        return msg
+
+    def scp_file(self, src_file, dest_dir):
+        """
+        src_file:
+        dest_dir:
+        """
+        if self.port:
+            cmd = "scp -P %s %s %s@%s:%s" % (self.port, src_file, self.user, self.ip, dest_dir)
+        else:
+            cmd = "scp %s %s@%s:%s" % (src_file, self.user, self.ip, self.dest_dir)
+        print(cmd)
+        process = pexpect.spawn(cmd)
+        self._expect(process)
+        msg = process.readlines()
+        process.close()
+
+        return msg
+
+
+if __name__ == "__main__":
+    test = Pexpect("root", "127.0.0.1", "123456", port=2224)
+    res = test.ssh_cmd("pwd")
+    print(res)
+    res = test.scp_file("./ip.txt", "~")
+    print(res)