Through the automobile tail gas,the wear between the tire and road and the leakage of oil leave on the road surface especially some busy roads surface can accumulate a large amount of pollutant just like suspended substance(SS).SS takes up very high rate among pollutant.The article analyses the characteristic of solid in road runoff,details the relationship between solid and other pollutant,its takeoff characteristic in water and the laws as the result of road runoff.It provides references on the control of...