P2P is used frequently in campus network technology. The application of this technology takes up a large number of bandwidth in a campus network. 80% of resources are occupied by 20% of users, which results in a bottleneck of a campus network bandwidth. According to the principle of P2SP technique and the characteristics of a campus networks design and use, this paper proposes concrete approaches to limit the number of P2SP resource server users based on ACL，which is used to control the net traffic.