Asphalt pavement is usually used to pave the surface of pavement, which is directly affected by vehicle load and atmospheric factors, and the physical and mechanical properties of asphalt mixture are greatly affected by climate and time factors. Therefore, the road surface can provide stable and durable service to the vehicle. Asphalt pavement must be required to have the following important characteristics: 1. Asphalt pavement has high temperature stability. 2. Asphalt pavement has low temperature crack resistance. 3. Asphalt pavement is water stable. 4. Asphalt pavement shall have fatigue resistance.