Abstract: Taking the NBS (NEMO basic support) protocol mobile network as the research subject, a route optimization scheme based on improved HMIPv6 mobile network was proposed to solve mobility management and route optimization problems. HMIPv6 and NBS were integrated to construct hierarchical mobile network architecture. Utilizing the regional mobility management mechanism, the registration costs of mobile nodes are reduced. Moreover, a novel route optimization scheme was also introduced through improving HMIPv6 to eliminate pinball routing of mobile network node. The analytical results show that the proposed scheme outperforms NBS in both additional packet overhead and mobility management overhead.