Abstract: Aiming at the problem of many repeated traffic in the network, the idea of offset-caching (OC) was put forward creatively based on the idea of large-scale access convergence network. In the backbone network, the hot content was pushed to the network access point as close as possible to the users. In the access network, the cached content in the network was multicasted access point to the users. The idea would provide a resolution to improve the quality of the user experience, reduce the network traffic and the server load.