In our report,the technical principle of MPTCP protocol is introduced. The relationship between cache size and throughput of TCP protocol and MPTCP protocol was also analyzed. Based on the research results,a cache calculation model for low latency and high bandwidth scene was established to calculate MPTCP cache size. Lastly,the local experiments and NorNet Core test bed experiment was designed and performed. The results showed that the cache value designed according to the model was only one half of the cu...