Abstract:The drainage asphalt pavement adopts the gradation of large voids, which has the advantages of reducing the water area of rainy days, anti-sliding and reducing noise. For asphalt mixture with large voids, its water damage resistance is the key to determine the durability of pavement. The drainage asphalt pavement uses open-graded asphalt mixture, and the selected asphalt is the high-viscosity modified asphalt treated by characteristic modification. This kind of modified asphalt can be used in wet and dry processes. At present, there are many ways to prepare the drainage asphalt mixture by dry and wet methods. A comprehensive comparison of water stability performance for these methods will be carried out to provide the technical support for the engineering applications.