The invention discloses a method of determining an object district in the switching process, comprising: receiving switching command of physical layer identification carrying along the object district by a user equipment (UE); acquiring the physical layer identification of adjacent districts from a synchronizing channel of the adjacent districts; when the acquired physical layer identification isconsistent with that carried along in the received switching command, determining the adjacent districts are the object districts. In addition, the invention also discloses a UE, a source base station and a determining system of the object district in the switching process. The technical scheme of the invention requires no dynamic broadcast channel, thereby saving delay of reading the broadcast channel, shortening interrupting time in the switching process, furthermore increasing the switching performance.