Infiltration of soil is an important process in hydrologic recycle and plateau ecology on the Qingha-iTibet Plateau. By the ex periment from 2005-2007, some factors like saturated hy draulic conductivity,gro und temperature, and vegetation coverage are analyzed. Results show that the values of saturated hydraulic conductivity in high vegetation coverage are higher that in low vegetation coverage. Relation of saturatedhy draulic conductivity with soil organic matter, total nitrogen, and particle size can be described by power function. With increased soil temperature, saturation infiltration decreases firstly and then increases sharply,which can be well described by a quadratic function. The environmental factors affecting infiltration into the alpine meadow soil can be gro uped into the three principal compo nents of soil texture and its physical and chemical properties, the loose degree of soil, and hy dro philic organic colloid.