The invention discloses a method and a system for avoiding an endless loop in a flexible ringing business. The method comprises the following steps of: sending a position request to a corresponding HLR (home location register) by an MSC (mobile switching center) according to a pilot number in a calling request, and meanwhile, setting a terminal access type parameter in a position request message;returning a position request response containing member number information of prepaid users and the temporary local number information of non-prepaid users by the HLR; establishing calls of a callingparty to members of an FA (foreign agent) group by the MSC according to the position request response, and in the processes of calling, during sending the position request message to the HLR by the MSC, setting a terminal access type parameter different from the first time again; and differentiating the position requests by the HLR according to different terminal access type parameters. The invention solves the problem that the MSC sends the position requests in an endless loop when the FA group contains one or more prepaid members so as to ensure that the flexible ringing business is more perfect.