Presently, the emerging of WiMax wireless broadband wide-area network technology is very important. Because of transmission distance and faster transmission, more and more researches have been devoted into this field. We hope to apply the technology into our daily life sooner the better. The M-Taiwan plans have been related to the infrastructure of the wireless environment in major cities. This paper is focused on using a set of GPS technology and integrated with 802.16e-Smart cars to provide a handoff mechanism, called the Intelligent Mobile Network Handoff Mechanism. An ASN-establishment of a DataBase Server, is the most important hope that through this DataBase to store information related to GPS, and through this Server to calculate the base station line, handoff. By using our proposed mechanism, a base station can be planned in advance on the path of choice. To reduce the number of possible handoff, scanning the channels and by the waste channel scanning the time it takes, hoping to provide a more stable WiMax services.