The invention discloses a bus transportation velocity extraction method based GPS (Global Positioning System) data of a bus, which belongs to the field of dynamic bus information acquisition and processing and is dedicated to the process of extracting transportation velocity by virtue of the GPS data of the buses. The method is characterized in that on the basis of GPS-acquired dynamic bus running data, the time of the bus passing through each two adjacent stops is judged according to the time in a running segmental arc of bus, which is positioned through the GPS data on the premise of correctly determining bus stops and line information; and then combining static information such as the distance between the stops and the like, the transportation velocity between the bus stops is figured out. The method is mainly applied to dynamic acquisition of the bus transportation data, is suitable for all the bus lines with GPS devices, overcomes the time delay of the conventional acquisition methods, greatly reduces the workload and can be applied to the aspects of dynamic bus monitoring, service evaluation and the like.