Abstract: Infiltration is the basic characteristics of soil water movement, and it is an important basis for the study of rainfall runoff, erosion, non-point source pollution, etc. It is of great significance to quickly and accurately determine and calculate soil infiltration rate and its infiltration depth. In this paper, soil samples were taken from the Beijinzhuang experimental field in Wuqing District, Tianjin. The infiltration test was carried out indoors（water depth: 5 cm）. Based on the measured soil water infiltration data, the three models, Philip, Horton and kostiakov-Lewis, were used to fit the cumulative infiltration amount. On this basis, with the cumulative infiltration amount as the independent variable, the infiltration depth was simulated, and the fitting effects of the theoretical model and the linear empirical model were compared. The results showed that different soils have different models; the theoretical formula based on the Horton infiltration model is more suitable for the infiltration depth simulation; compared with the conventional air-dried soil with high moisture content, the infiltration test soil column prepared by using the soil with high moisture content significantly reduces the soil infiltration rate.

Key words: soil infiltration, infiltration depth, Horton model, section moisture content