许多基于P2P方式的流媒体协议都假设节点是合作的，而没有考虑到存在自私节点的问题。本文提出了P2P流媒体系统中一种积分检测相结合的激励机制。节点通过自身或子节点共享数据流获得贡献积分，贡献积分越高，节点获得数据流的优先权就越高；为了贡献积分最大化，节点有选择地对它的子节点进行检测来促进子节点数据的共享，从而提高整个系统的性能。分析和模拟实验表明使用该机制能解决长期历史积分问题，提高合作者比例，并维护了较高的系统性能。

Many P2P media streaming protocols assume that peers are all collaborative. They do not consider about the problem of selfish peers. We propose a score and monitoring based incentive mechanism for P2P media streaming system. In this mechanism each peer obtains contribution score in two ways: uploading data to others by itself and by its child peers. The peers with higher scores have better chances to download data. To maximize the score, peer can choose to monitor its child peers to stimulate sharing, accordingly improve the system performance. Through simulation, we verify that the proposed incentive mechanism can solve the long-term history score problem, increase the cooperative proportion and maintain higher system performance.