In mobile IPv6,a route optimization (RO) protocol is proposed to solve the triangle routing (TR) problem,which allows packets to be routed along an "optimal" path. However,RO introduces additional control massages which may cause high signaling costs,and thus RO is not always optimal. The main idea of this paper is to make a performance comparison between TR and RO under diverse network conditions,and find a more effective routing scheme. Several key parameters are introduced into the mathematical analysis such as the packet arrival rate,the mobility rate and the distance,and the total cost function is founded to capture the trade off between network resources consumed by signaling and data routing. Based on the analysis,a new scheme (packet-to-mobility route optimization,PMRRO) is proposed to minimize the total cost. In PMRRO,the route between the MN (mobile node) and the CN (correspondent node) is chosen adaptively according to the value of key parameters such as PMR (packet-to-mobility). Simulation results indicate that the PMRRO scheme has better performance than RO or TR,and it is useful to improve the efficiency of mobility management.