Abstract: By analyzing the safety interactive relation between vehicle and road surface use,it can be concluded that antislippery performance of road surface is a key factor for appraising safety of road surface use and six basic coefficient indexes have been put forward:Transit allow friction,Side allow friction,Transit require friction,Side require friction,Transit and Side safety state “standard value”,a set safety model of road surface use is set up.By testing and comparing with traffic accident type of a case in a section of classⅡof NH (national highway),the road safety model of surface use is feasible and its coefficient of friction quantized standard Δf=13.2 which has been attained.It's higher than the minimum value of bituminous penetration macadam or gravel in highway maintenance specification.It is easy to lead traffic slip accident.