Cracks are the main factors that restrict the service life of semi-rigid asphalt pavement. If it can not be processed in time, it will easily cause the early damage of pavement. In this paper, the causes of cracks in all kinds of semi - rigid base slabs are analyzed, and some treatment techniques of cracks are put forward according to the engineering practice. From the above analysis, we can see that if the crack can not be timely and effective to prevent water infiltration to the inside of the road, to avoid the expansion of cracks will result in serious pulp, pits, and even structural damage, resulting in the use of the entire road function. Asphalt with viscoelastic properties, can ensure that the closure of cracks, to prevent the invasion of water, irrigation joints of the asphalt is often used heavy traffic AH-90 asphalt, and sometimes to ensure a better blocking effect can also be used to soften the higher, Better adhesion, better temperature sensitivity of modified asphalt, such as SBS modified asphalt. The specific approach is: the asphalt heating (150 ~ 160 ��) directly into the cracks, until the asphalt temperature dropped to room temperature after the opening of traffic. Road Sealing Machine - Road Machinery Equipment Manufacturers - Doan Machinery how to patch cracks in driveway concrete surface profile standards sure speed concrete vibrator