By taking nine typical wind power sites built in the Jiuquan gobi desert for an example, impacting index of soil and water loss for wind power site construction in the gobi desert area was calculated and a range of impacting indexes for the gobi desert areas in China was determined through the calculation, analysis and grading of the impacting index of soil and water loss. The data like engineering properties, cover area, excavation and embankment volume and construction technology involved in the project were obtained by combining data collecting with in-situ monitoring. It follows from the calculation that the impacting index of soil and water loss for wind power site construction in the gobi desert area was 0.3140.