Abstract: A new kind of Anycast communication model in mobile IPv6 networks which is built on a tree topology is proposed.The model combines Unicast technology and Multicast technology.Each mobile node in this model has only one permanent address-home address with which it can achieve the communication with clients.In addition,this model can perform IPSec which is difficult to implement in the existing mobile IP communication models.In an IPv6 simulation environment,the experimental data prove the model's effectivity,practicability and efficiency.