The utility model discloses a traffic calculation system, which comprises a GSP module, a comparison threshold module, a detection module, an algorithm calculation module, a delay module, a signal reading module, a signal transformation module and a reporting module, wherein the GSM module and the comparison threshold module are connected with the input terminal of the detection module; the output terminal of the detection module is connected with the algorithm calculation module; the algorithm calculation module is respectively connected with the delay module and the signal reading module; and the signal transformation module is respectively connected with the signal reading module and the reporting module. The utility model provides another traffic calculation method, which can improve the traffic calculation accuracy.