The present invention discloses a switch method ensuring communication continuity, mainly including: when a switch occurs to an Mobile Station (MS), the MSC Server controlling the MGW establishing in a context a new termination connected with a new ground circuit; after the MS switching to a new wireless channel, the MGW controlling the new termination inheriting a resource channel from an original termination connected with an original ground circuit and continuing with the communications through the resource channel. The method of the present invention solves the problem of interruption in an announcement service, a data service and a QNC service caused by a switch process and the communication continuity during a switch procedure is ensured.