Under the action of water flow and vibration of rolling machinery, it is beneficial for particles with small particle size to fill the pores, thus increasing the compactness of the structural layer. Tamping machine is used for tamping tamping materials. Tamping material is to make water uniform, just like compaction of soil. After sprinkling water and stirring, tamping the material is also to make water enter the sample evenly. Otherwise, the water content in different positions in the sample is different, which will affect the compaction result.