４年防沙实践证明：莫高窟崖顶防沙试验的工程设计构思是正确的，设计依据科学可靠，防护效益显著。对保护石窟和壁画已经起到重要的作用．其具体防护作用是：１）直接控制偏西风向洞窟搬运沙量的９５％左右；２）洞前夜间积沙减少了８０％以上；３）外围栅栏对来自主风向的外侧积沙的侧导率平均为３５％；对内侧积沙的侧导率，在偏东风作用下可达５７．５１％，在偏西风作用下平均为１５．８９％．上述防沙作用均具有明显的季节变化。 4 years of sand control practice proved that: Mogao Grottoes cliff top sand control engineering design concept is correct, based on scientific and reliable design, significant protective benefits. To protect the grottoes and murals have played an important role. Its specific protection function is as follows: 1) direct control of about 95% of the total amount of sand carried by the westerlies to the caves; 2) the sediment discharge during the night before the cave is reduced by more than 80%; 3) The average lateral rate was up to 57.51% under the east-easterly wind and 15.89% under the west-westerly wind. The sand control has obvious seasonal changes.