Some problems including protrusion value of diamond grit,amount of simultaneously active diamonds on the matrix,wear on diamond impreganted bead,equivalent quartz content and erosive wear on diamond impreganted tools that worthed to discuss in the research work of diamond impregnated tools were raised from the analyzing of wear factors in diamond impregnated tools.

Accordingto the actual problems of the porosity in asphalt surface,the relation of the asphalt surface porosity with the pavement first-stage damage,water permeable property,strength of the asphalt mixture,water stability of the asphalt mixture are analyzed.