Mechanical properties of asphalt concrete is the result of common effect of aggregate and asphalt mortar.The grading and the concentration of filler have important effect on the properties of asphalt mortar.This paper used laser particle size analyzer to measure the grading of filler.The asphalt mortar was prepared with 5 kinds of filler and 3 kinds of filler concentration,it carried out the test of penetration, softening point and tensile strength,and got the influence law of filler gradation and filler concentration on the physical and mechanical property of asphalt mortar.With the increase of filler fineness and concentration,the physical and mechanical properties of asphalt mortar strengths,the viscosity increases.The filler concentration have greater effect on the performance of core wall asphalt concrete.When the filler gradation is the same,with the increase of filler concentration, Marshall stability increases and the flow value decreases.