Method for guaranteeing safety of multi-carrier switching or reconstructing in multi-carrier communication system

The invention discloses a method for guaranteeing safety of multi-carrier switching or reconstructing in a multi-carrier communication system, and the method comprises the following steps: a terminal or a source base station or a switching target base station selects one from a plurality of target cells to serve as a switched main carrier cell or a switching target cell during a switching process, and the terminal uses a parameter of the switched main carrier cell or the switching target cell to compute a terminal safety key; the source base station or the switching target base station uses the parameter of the switched main carrier area or the switching target cell to compute the safety key of the switching target base station, wherein the safety key is corresponding to the terminal; during reconstruction, the terminal and a network side reconstructing target base station respectively compute an authentication code for intercepting the short message integrality; and the authentication code for intercepting the short message integrality at the terminal is in match with that at the reconstructing target base station, and the reconstructing target base station determines the context corresponding to the terminal so as to continue the reconstructing process. The method provided by the invention is simple in configuration and reliable, and can be used for effectively guaranteeing the safety in switching and reconstructing.