[ Objective ] To explore the law of soil wind erosion in degraded bare patches of alpine meadow, and to provide scientific basis for vegetation restoration and ecological environment protection in degraded meadow area. [ Methods ] In this study, we selected the bald patches formed by the degradation of plateau pika activity in Henan County, Qinghai Province as the research object. Under the three wind speeds of 9,12 and 15 m / s, the degraded bald patches with different vegetation coverage ( 0 %, 20 %, 40 %, 60 %, 80 % ) were subjected to in-situ simulated wind erosion experiments to explore the effects of vegetation coverage on soil wind erosion under different wind speeds. [ Results ] ① The soil wind erosion rate of degraded bare land showed a trend of rapid decline and then tended to be gentle over time ( p < 0.05 ). ② Under the wind erosion test with a total duration of 60 min, the first 10 min is the sensitive period of soil wind erosion rate change. Under the three wind speeds, there was a significant negative exponential function relationship between vegetation coverage and total sediment discharge ( R2 = 0.98 ). The greater the absolute value of the exponential coefficient, the weaker the inhibitory effect of vegetation coverage on wind erosion at higher wind speeds.③ With the increase of vegetation coverage, the sediment transport in the height range of 0-5cm decreased significantly, and the sediment transport of each vegetation coverage decreased gradually with the increase of height. [ Conclusion ] Increasing vegetation coverage can effectively reduce the wind erosion rate and sand transport height, but at higher wind speeds, the inhibition effect of vegetation coverage on wind erosion is significantly weakened, and the key threshold of vegetation coverage to inhibit soil wind erosion is about 40 %. With the continuous increase of vegetation coverage, the marginal benefit of wind erosion reduction gradually decreases.