The present invention discloses a method, a device, and a system for network exit or de-registration of a femto base station. The network exit method includes: performing, a de-registration procedure with an access gateway; de-authenticating the femto base station through a security gateway and an authentication server; and tearing down a tunnel between the femto base station and the security gateway. The de-registration method includes: receiving, a de-register request message from an access gateway, where the de-register request message carries a first identifier of a neighboring base station or/and a second identifier of an access gateway other than the access gateway; directing a terminal currently served by the femto base station itself to hand over to the neighboring base station corresponding to the first identifier or/and registering with the other access gateway corresponding to the second identifier; and sending a de-register response message to the access gateway.