In order to study the quantitative relationship between the attenuation rule o fas-p halt pavement and the mechanical indexes of coarse aggregate， the friction coefficient of the friction coefficient of the asphalt mixture with three grades， four kinds of coarse aggregate and 12 kinds of coarse aggregate were tested by the small four wheel acceleration loading test equipment.Testresults show that the asphalt mixture mainly affect the initial friction coefficient of asphalt pavement， but the influence of attenuation law(attenuation ampli-tude， decay rate， final value of attenuation etc.) of the friction coefficient is not significant.The mechanical indexes(wear value， crushing value， polishing value) of coarse aggregate used in asphalt mixture have remarkable influence on the anti-sliding performance of as-p halt pavement.Crushing value and abrasion value smaller， polished value is greater， the corresponding friction coefficient of asphalt mixture decay rate is smaller， the attenuation amplitude was smaller， the attenuation value is smaller， and viceversa.The quantitative re-lationship model between the attenuation law of friction coefficient and the aggregate index is established.