The present invention discloses a method and system for allocating Network Temporary Identities. The method comprises: obtaining capability information of a Home NodeB; allocating information for performing identity allocation to the Home NodeB, according to the capability information; sending the allocated information for performing identity allocation to the Home NodeB, so that the Home NodeB implements network temporary identity allocation according to the information for performing identity allocation; wherein the different information for performing identity allocation corresponds to different Home NodeBs to implement the network temporary identity allocation. The technical solution disclosed by the present invention can reduce the implementation complexity of Home NodeB Gateway and the time delay.