Alpine soil infiltration process is an important part of hydrological features of the alpine soil in permafrost regions. The research is carried out in the source regions of the Yellow River, where permafrost is degrading severely, with the methods of choosing typical areas and quadrats to do experiment and simulation and then to study the soil water characteristic curves, soil saturated hydraulic conductivities, soil infiltrations and soil moistures under different characteristics of degraded vegetation. The results show that the empirical equation θ=AS-B proposed by Gradner and Visser has a good simulation of the soil moisture characteristic curves; soil saturated hydraulic conductivity and soil infiltration have significant difference under different vegetation coverage: in the soil surface within 0~10 cm in depth, the saturated hydraulic conductivity and infiltration intensity of the black beach are the maximum; in the soil layers 30 cm below the surface, vegetation has almost no impact on the saturated hydraulic conductivity, infiltration intensity and soil moisture content. Remarkable reduction of soil moisture occurs in the soil surface with the degradation of vegetation. The more serious the degradation is, the more the water loss. The water loss can be up to 38.6% in the worst situation. The soil moisture in the depth between 10 cm and 20 cm, where vegetation root systems develop well, has the greatest impact on the soil environment. Thus the loss of moisture in the depth between 10 cm and 20 cm will induce restoring the degraded meadow hardly. Through a comparative study, it is found that Kostiakov infiltration equation  f(t)=at -b  is more applicable to study the process of soil moisture infiltration of the alpine meadow in the source regions of the Yellow River.