According to the 5 years' observation,the study on the precipitation and runoff of man-made plant community in central Yunnan Plateau was conducted,and some results are as follows: the season distribution of precipitation in the area is uneven,the rainfall of wet season account for 86.64% of the year totals,the precipitation is mainly brought by rainfall with more than 10mm,and most of the rainfall intensities are less than 5 mm/h.Compared to wasteland,the forest land have a notable effect of soil and water conservation.In trial watershed,the runoff has a highly correlation with precipitation,and soil erosion is determined by runoff primarily,following the precipitation.