Abstract:Using the Guelph Infiltration Meter, has carried out the investigation for the soil infiltration in typical grass land in Babao River Basin of Qilian Mountain, also based on the Kostiakov Model and Horton Model, has simulated the water infiltration characteristic. The results showed that the average soil initial infiltration rate was 1.66 cm·min^-1 and the steady infiltration rate was 0.99 cm·min^-1 in the Ebao sample region. The average soil initial infiltration rate was 0.47 cm·min^-1 and the steady infiltration rate was 0.21 cm·min^-1 in the Arou sample area. The infiltration rate was increased with the rise of the altitude. At the same time, the infiltration rate was the positive correlation with the soil moisture content. The whole infiltration process can be divided into three phases: The infiltration rate of 0～10 min was the rapid change stage; the infiltration rate of 10～30 min was slowly change phase and after 30 min the infiltration rate was gradually to reach the stability. The fitting effect of Kostiakov Model was go od for the Arou sample area; but the Horton Model was suitable for the Ebao sample region.