Registrating roaming custom IP address in evolution network and service using method

The present invention provides roaming user IP address register and service use method in evolution network, suitable for wireless communication field. Said method includes A, UE originating register to visited network; B, visited network feeding back configured Local Breakout route optimizing strategy information to UE; C, in proceeding service originating IMS register, UE according to said Local Breakout route optimizing strategy information judging whether service using Local Breakout route optimization function to register home network to IMS system or to visit network distributed IP address. The present invention solves two IP addresses register and use.