China’s high performance broadband information network, named 3Tnet, is a new network with large-scale video services. Based on the architecture of VOD service over 3Tnet, a new dynamic collaborative merging scheme is proposed. This scheme employs a dynamic collaborative merging scheduling algorithm based on a patching multicast policy to further reduce bandwidth requirement of the edge network for VOD service over 3Tnet. Simulation results show that, with 3 000 movies, the proposed scheme can save about 28.2% bandwidth of the edge network and 47.2% bandwidth of the residential network, respectively, compared with a peer-to-peer chaining policy. Moreover, compared with the patching multicast policy, this scheme can save about 17.6% bandwidth of the edge network by slightly increasing bandwidth (about 3.8%) of the residential network.