Abstract: Through the integrating analysis on sand preventing history of Mogao Grottoes,the paper considers that Mogao Grottoes as the world brilliant ancient gems is an important door of Gansu province for opening up to the world,also an important touring spot in our country.Only negative sand clearing has already not suit to the ecological environment construction,not met the need of touring as the developing basic point in this region and not satisfied the quality and ecological environment that modern society requires.To create a fine touring and cultural relic protecting work conditions will not only benefits the improvement of the ecological environment in Mogao Grottoes,but also enhances desertification control technology to a new lever in whole Hexi region,Gansu province.Based on the features of blown sand in Mogao Grottoes,the paper proposes a guiding thought of preventing system which gives priority to prevent NW,SW winds.The preventing principle including measures of cutting off and eliminating Minsasan sand source,stabilizing drifting sand and eliminating sand rising on sandy gobi,will be adopted.A multi-arrangement,multi-function preventing system will beset up,which made up of engineering,biological,chemistrical measures to eliminate blown sand disaster.Meantime,the paper also gives a elementary discuss about the entire layout and construction content of the preventing system including preventing width and principle of gravel bedding and pressing.

Key words: Mogao Grottoes, multi-arrangement and multi-function sand preventing system, guiding thought, entire layout