A network handover method, comprising: receiving, by a mobile switching center, MSC, a first handover request message sent by a mobility management entity, MME, wherein the first handover request message is used for requesting the MSC to hand over user equipment, UE, from a long term evolution, LTE, network to a circuit switching, CS, domain of a second generation, 2G, or third generation, 3G, network for circuit switched fallback, CSFB; sending, by the MSC, a third handover request message to a base station in the 2G or 3G network, wherein the third handover request message is used for requesting the base station to allocate a CS domain resource to the UE for handing over to the CS domain of the 2G or 3G network, wherein the CS domain resource includes a CS domain wireless resource; receiving, by the MSC, a third handover request response message sent by the base station, wherein the third handover request response message comprises information about the CS domain wireless resource; sending, by the MSC, a first handover response message to the MME, wherein the first handover response message comprises the information about the CS domain wireless resource; and receiving, by the MSC, a handover completion message sent by the UE, wherein the handover completion message is used for indicating that the UE completes handing over from the LTE network to the CS domain of the 2G or 3G network; sending, by the MSC, a session release message to the UE, wherein the session release message is used for requesting the UE to release a third session that is generated by the UE during handing over from the LTE network to the CS domain of the 2G or 3G network; wherein before the sending, by the MSC, a session release message to the UE, the method comprises one of the following steps, receiving, by the MSC, a first CS call connection setup request message sent by the UE, wherein the first CS call connection setup request message is used for requesting the MSC to generate a first session; or receiving, by the MSC, a call confirmation message responding to a second CS call connection setup request message, wherein the second CS call connection setup request message is sent by the MSC to the UE for requesting the UE to generate a second session wherein the first handover request message is used for indicating that the UE supports a handover from the LTE network to the CS domain of the 2G or 3G network. receiving, by a mobile switching center, MSC, a first handover request message sent by a mobility management entity, MME, wherein the first handover request message is used for requesting the MSC to hand over user equipment, UE, from a long term evolution, LTE, network to a circuit switching, CS, domain of a second generation, 2G, or third generation, 3G, network for circuit switched fallback, CSFB; sending, by the MSC, a third handover request message to a base station in the 2G or 3G network, wherein the third handover request message is used for requesting the base station to allocate a CS domain resource to the UE for handing over to the CS domain of the 2G or 3G network, wherein the CS domain resource includes a CS domain wireless resource; receiving, by the MSC, a third handover request response message sent by the base station, wherein the third handover request response message comprises information about the CS domain wireless resource; sending, by the MSC, a first handover response message to the MME, wherein the first handover response message comprises the information about the CS domain wireless resource; and receiving, by the MSC, a handover completion message sent by the UE, wherein the handover completion message is used for indicating that the UE completes handing over from the LTE network to the CS domain of the 2G or 3G network; sending, by the MSC, a session release message to the UE, wherein the session release message is used for requesting the UE to release a third session that is generated by the UE during handing over from the LTE network to the CS domain of the 2G or 3G network; wherein before the sending, by the MSC, a session release message to the UE, the method comprises one of the following steps, receiving, by the MSC, a first CS call connection setup request message sent by the UE, wherein the first CS call connection setup request message is used for requesting the MSC to generate a first session; or receiving, by the MSC, a call confirmation message responding to a second CS call connection setup request message, wherein the second CS call connection setup request message is sent by the MSC to the UE for requesting the UE to generate a second session wherein the first handover request message is used for indicating that the UE supports a handover from the LTE network to the CS domain of the 2G or 3G network.