本文根据莫高窟风沙活动规律和风沙危害方式对以往的防沙工程进行了评述，提出了治沙的必要性和长久性，建议在窟顶沙山前沿应采取以阻沙为先导，以窟顶戈壁输沙及崖体固沙为两翼的“六带一体”的防护体系。

Mogao grottoes have suffered from serious blown sand disasters.In the past half a century,many protective engineering projects were set up early or late in the upper wind areas of Mogao grottoes,yet they were not fully effective because the ways adopted to control sands were unreasonable. Based on the regularities in the motion and the threat of blown sands, this paper is to assess the protective engineering in the past and to discuss the necessity of long-term sand controlling.At last the authors suggest that a protective system of "six belts in a system" shouldh established.