Abstract
With the computer's processing speed increase rapidly in recent years and cloud computing getting development, cloud data processing has become a major issue, how to be more rapid and efficient processing of information is one of the factors of transmission efficiency, we hope to improve the current throughout by using multipath transmission rather than single tcp path, multiple-path not only to enhance the transmission speed but also more efficient use of network resources further, through this paper simulation of multipath-tcp from two to four transmission performance under different conditions we hope to see the real effectiveness mptcp applications in the Internet.