Mobility is an important feature of future Internet, and mobility of mobile node in IPv6 has been designed as RFC3775, with optimized route and safeguard of binding messages as its characters. However, as the development of sensor network and personal network, the ability of allowing node and route, which reside in a moving network, to visit Internet is imminent for applications in reality. Although some approaches to support network mobility are proposed based on extension of mobile IPv6, resolving the basic routing in mobile networks, nested mobile networks is still confronting serious issues, such as binding updates explosion, triangle route, and source address filtration, resulting. In this paper, we propose an approach to optimize route in IPv6 nested mobile networks by designing mobile router chain, which can be used by mobile and fixed networks and nodes, residing in a mobile network, to analyze the nested topology and improve mobility management in result. (4 pages)