A method employed in a cellular network that has an inactive state for controlling states of a user equipment, applied to the UE, the method comprising the following steps carried out by the UE: detecting whether a preset state switching event is triggered, when the UE is in an inactive state; sending a state indication message for indicating that the UE needs to switch to a connection state, to a base station, upon detecting that the preset state switching event is triggered, wherein a state switching instruction for instructing the UE to switch to the connection state is returned by the base station according to the state indication message; switching from the inactive state to the connection state according to the state switching instruction; wherein the preset state switching event comprises at least one of the followings: a bearer corresponding to traffic data to be sent by the UE does not belong to a designated bearer that is a bearer capable of transmitting traffic data in the inactive state; and a bearer corresponding to traffic data to be received by the UE does not belong to the designated bearer; wherein: when the preset state switching event comprises that the bearer corresponding to the traffic data to be sent by the UE does not belong to the designated bearer, or comprises that the bearer corresponding to the traffic data to be received by the UE does not belong to the designated bearer, prior to detecting whether the preset state switching event is triggered, the method further comprises: receiving an inactive state instruction of the base station, wherein the inactive state instruction comprises configuration information of the designated bearer for indicating a traffic type of traffic data corresponding to the designated bearer; entering the inactive state according to the inactive state instruction, and storing the configuration information of the designated bearer; and performing the step of detecting whether the preset state switching event is triggered according to the configuration information of the designated bearer and according to a traffic type of the traffic data to be sent or received by the UE. detecting whether a preset state switching event is triggered, when the UE is in an inactive state; sending a state indication message for indicating that the UE needs to switch to a connection state, to a base station, upon detecting that the preset state switching event is triggered, wherein a state switching instruction for instructing the UE to switch to the connection state is returned by the base station according to the state indication message; switching from the inactive state to the connection state according to the state switching instruction; wherein the preset state switching event comprises at least one of the followings: a bearer corresponding to traffic data to be sent by the UE does not belong to a designated bearer that is a bearer capable of transmitting traffic data in the inactive state; and a bearer corresponding to traffic data to be received by the UE does not belong to the designated bearer; a bearer corresponding to traffic data to be sent by the UE does not belong to a designated bearer that is a bearer capable of transmitting traffic data in the inactive state; and a bearer corresponding to traffic data to be received by the UE does not belong to the designated bearer; wherein: when the preset state switching event comprises that the bearer corresponding to the traffic data to be sent by the UE does not belong to the designated bearer, or comprises that the bearer corresponding to the traffic data to be received by the UE does not belong to the designated bearer, prior to detecting whether the preset state switching event is triggered, the method further comprises: receiving an inactive state instruction of the base station, wherein the inactive state instruction comprises configuration information of the designated bearer for indicating a traffic type of traffic data corresponding to the designated bearer; entering the inactive state according to the inactive state instruction, and storing the configuration information of the designated bearer; and performing the step of detecting whether the preset state switching event is triggered according to the configuration information of the designated bearer and according to a traffic type of the traffic data to be sent or received by the UE. receiving an inactive state instruction of the base station, wherein the inactive state instruction comprises configuration information of the designated bearer for indicating a traffic type of traffic data corresponding to the designated bearer; entering the inactive state according to the inactive state instruction, and storing the configuration information of the designated bearer; and performing the step of detecting whether the preset state switching event is triggered according to the configuration information of the designated bearer and according to a traffic type of the traffic data to be sent or received by the UE.