The current P2P streaming systems has the advantages of selforganization, fault tolerance, anonymity and so on. But it is still challenging to support robustness and high video playback rates. In this paper, we propose a hierarchical P2P Streaming System (HPSS) to support high video playback. With HPSS, the peers are hierarchically grouped into clusters according to bandwidth and delay, a multilayer hierarchy is formed among clusters to retrieve video data from the source server. By actively balancing the upload capacity among clusters, HPSS can efficiently solve the problem of how to support high video playback rate, approaching the maximum achievable streaming rate of a P2P streaming system. At the same time it can guarantee the system is of good robustness, while the cluster head fails, it does not decrease the streaming rate of the streaming system. Finally the result of simulation demonstrates these advantages of HPSS.