Cracking is one of the early damage types for pavement, the bending fracture features about SBS asphalt mixture and ordinary asphalt mixture beam were studied by the three point bending beam test, the deformation and damage complete progress of asphalt mixture beam were recorded by CCD, furthermore, the SEM study of asphalt concrete meco interface pattern before loading and after fracture were observed. The result of the test shows that the bending fracture property of SBS asphalt mixture is better than that of ordinary asphalt mixture, and the property of asphalt, boundary character between asphalt and aggregate, loading rate are significant factors that affect asphalt mixture property.