A method and system for improving network reliability by realizing dynamic route of signaling, mainly includ the following steps: terminal element TE sending registration request to service element SE though network element NE; when the NE receiving the registration from the TE, the NE obtaining the SE which provides signaling service for TE according to the record of information interchange between NE and SE/TE. By use of the method, present SBC device can support dynamic signaling route, and thereby, the fault tolerance ability of NGN network can be improved, furthermore, network reliability of NGN is improved.