Abstract:VCP can't adjust the congestion window according to the congestion degree because of insufficient feedback information,and shows slow convergence speed with the burst traffic flows.This thesis presents a improved VCP congestion control algorithm named VCP-BE in high bandwidth delay product networks,which uses the end-to-end bandwidth estimation algorithm and two existing ECN bits to improve the accuracy of congestion information feedback, provides more precise congestion control information for the source congestion window adjustment.Simulations show that the improved VCP-BE can adapt to high bandwidth delay networks, has faster fair convergence speed than VCP and MLCP.