Application of Disc permeameter in field and sandbox-pressure chamber in door was used to determine hydraulic parameters and pore size distribution for soil samples of various aged plateau zokor mounds on Zoige grassland. Compared to the control grassland soil, the water content in structural pores (θ_str) of mounds increased, while the water content in soil textural pores (θ_txt) decreased from (0.14±0.02) cm³/cm³ to (0.10±0.02) cm³/cm³, indicating a potential of a quicker water infiltration through mound soil via soil structural pores. In soil with newly-formed mound and one-year-old mound, the effective porosity of soil pores with size r > 250 μm increased by 30% and 11%, and the saturated hydraulic conductivity increased by 38% and 21%, respectively, compared to the control soil. Therefore, it can be concluded that the excessive activity of zokor has changed soil pore structure, caused a decrease in soil's capacity to hold plant-available water and thus may accelerate the degradation and desertification of Zoige grassland.