Abstract:For the free-rider problem in peer-to-peer networks, proposes an incentive mechanism of monitoring control. According to the number of free-rider nodes in networks, divides it into three grades and uses different tactics at each grade. Proposes a penalty strategy based on bandwidth allocation. Simulation results show that the incentive mechanism not only reflects the fairness of node services and improves the success rate of downloads, but also protect the economic interests of developers.