Abstract: Embodiments of the present invention provide a circuit switched fallback method and a user equipment. The method includes: sending a request message to an LTE network, where the request message is used for requesting a CS voice service from the LTE network, so that the LTE network sends a CS voice service fallback response message to a user equipment, where the CS voice service fallback response message is used for instructing the user equipment to perform CSFB from the LTE network to a GSM network; after the CS voice service fallback response message sent by the LTE network is received, acquiring a system message of a target cell in the GSM network; and camping on the target cell according to the system message and initiating a CS registration process according to the system message, to perform the CS voice service.