The invention discloses a measuring, calculating, supervising, monitoring and processing method and system synthesizing vehicle data. According to the supervising method, one or more of vehicle operation parameters of a vehicle are measuring and calculating objects, and whether the power transferring condition of the vehicle is abnormal or not is judged according to a join operation value of the measuring and calculating objects and reference data of the measuring and calculating objects; and the join operation value is obtained through calculation based on a vehicle motion balance computational formula. By implementing the method, vehicle power transferring abnormality caused by operation failures comprising those of rotary working type power or transmission parts of a vehicle can be supervised.