The present invention provides a method, a device, a network element and a system for-switching a network. The method may include: obtaining, through a first network that a terminal accesses, a message required by a preparation process before the terminal switches to a second network; alternating with the second network according to the message, after the preparation process before the switching is completed, releasing a first connection so as to make the terminal directly establish a connection to the second network after releasing the first connection channel. According to the solution of the present invention, the problem of interference generated when two networks switch is avoided.