Present invention relates to mobile network accessing method. It contains configuring network centre zone, setting mobile switching center ( MSC ) in said network centre zone, connecting network centre zone surrounding public exchange telephone network ( PSTN ) office with neighboring base station controller ( BSC ), when user originating calling, handshaking procedure MSC judging whether called user is user in same BSC coverage area or PSTN user connected with BSC, if it is, then MSC controlling BSC accessing network, BSC completing calling handshaking procedure. Said invention can greatly save network transmission line. |