Nowadays, privacy protection for identity and trajectory has been a hot point in research and application field of Mobile IPv6 (MIPv6). Targeting on the problem that the mobile message and application data of mobile node suffers from malicious data analysis to expose its identity and to be located and tracked, an MIPv6 address privacy protection mechanism named IMTP was proposed, which supports hidden identity and prevents location tracking. In the first place, by applying self-defining mobile message option Encryptedword and making XOR transformation with home address, IMTP achieved the privacy protection of MIPv6 node identity. In the second place, by means of the mutual authentication technique among any nodes, this mechanism completed the randomly appointing of location proxy and hided the care of address of mobile node, thus to realize the privacy protection of MIPv6 node trajectory. The result of simulation indicates that IMTP has the higher quality of privacy protection and low resource cost. Meanwhile, it not only modifies a little of the standard MIPv6 protocol and well supports routing optimization, but also possesses flexible deployment, strong scalability and other advantages. The dual privacy protection for identity and trajectory provided by IMTP will be benefit to reduce the probability that specific mobile node communication data would be intercepted, thus to guarantee the communication security among the mobile nodes.