Abstract: In the report, the four path management algorithms of MPTCP were introduced. The quantitative formula of the MPTCP path management performance evaluation index-bandwidth aggregation benefit (B) factor was proposed, and which was used to evaluate the test data in order to help researcher quantify the bandwidth aggregation benefit of MPTCP. According to the different network scene test, the conclusion that full mesh path management algorithm has the best performance was demonstrated by the calculation of the performance evaluation index (B).