The invention discloses an inter-system mobility management method. At a UE side, the method comprises a mobility state information reporting step of reporting self mobility state information to an eNodeB after extended service request signaling is sent to an MME, wherein the mobility state information comprises position information, mobility speed information and mobility direction information; a residing cell determining step of carrying out inter-system measurement according to frequency point configuration information fed back by the eNodeB; and selecting a target cell determined by the inter-system measurement result to reside. According to the method, the frequency points are configured precisely; and the measurement pressure is reduced.