This paper puts forward a newindex: the coefficientofgeneral vibrationCgv—for evaluating au-
tomobiles’ride quality. Taking a Changan bus as an example, it presents the methods of determining the
weighted coefficients of velocity, location, road proportion and anthropological factor,etc., which are to be
used in obtaining the index ofCgv. These methods can make it more convenient and reasonable to predict
the ride quality of a concept automobile.