A method of a transient handover for performing packet offloading, used in a communications system, wherein the communications system is used in a cellular network, the method comprising: finding, by a mobility management entity, MME,, at least one qualified user equipment, UE, executing an application from a plurality of user equipment, UEs, according to a determining method, and transmitting a handover-transient request to the qualified UE; finding, by the qualified UE, whether there is a wireless local area network after receiving the handover-transient request; transmitting, by the qualified UE, an access request to the wireless local area network after finding the wireless local area network; and accessing, by the qualified UE, the wireless local area network, and transmitting a handover-transient ACK to the MME; characterized by releasing, by the MME, a bearer resource of the qualified UE, updating a state of the qualified UE in non-access stratum to an evolved packet system mobility management transient state, EMM-TRANSIENT State, to retain bearer information of the qualified UE, and handing over the qualified UE from the cellular network to the wireless local area network after receiving the handover-transient ACK, wherein the determining method is for finding the qualified UE according to one or more factors, the factors comprising: whether a radio resource of a base station that the UEs belong to is lower than a first threshold; whether a mobility of the UEs is lower than a second threshold; whether the UEs are in a power efficient mode; and whether a traffic type of the UEs is non-real time, NRT. finding, by a mobility management entity, MME,, at least one qualified user equipment, UE, executing an application from a plurality of user equipment, UEs, according to a determining method, and transmitting a handover-transient request to the qualified UE; finding, by the qualified UE, whether there is a wireless local area network after receiving the handover-transient request; transmitting, by the qualified UE, an access request to the wireless local area network after finding the wireless local area network; and accessing, by the qualified UE, the wireless local area network, and transmitting a handover-transient ACK to the MME; characterized by releasing, by the MME, a bearer resource of the qualified UE, updating a state of the qualified UE in non-access stratum to an evolved packet system mobility management transient state, EMM-TRANSIENT State, to retain bearer information of the qualified UE, and handing over the qualified UE from the cellular network to the wireless local area network after receiving the handover-transient ACK, wherein the determining method is for finding the qualified UE according to one or more factors, the factors comprising: whether a radio resource of a base station that the UEs belong to is lower than a first threshold; whether a mobility of the UEs is lower than a second threshold; whether the UEs are in a power efficient mode; and whether a traffic type of the UEs is non-real time, NRT. whether a radio resource of a base station that the UEs belong to is lower than a first threshold; whether a mobility of the UEs is lower than a second threshold; whether the UEs are in a power efficient mode; and whether a traffic type of the UEs is non-real time, NRT.