Abstract: In order to study the role of Three North Shelterbelt Project on ecological environment change in Horqin sandy land, for providing the basis for later engineering planning. According to the most typical region 1961-2010 years of meteorological data, the average wind speed, wind and the dust weather before and after Three North Shelterbelt Project construction were analyzed. The results showed that: in the recent 20 years, the average wind speed was 3.2-3.3 m/s between fluctuation in Horqin sandy land, sandstorm weather was a sharp decline trend, by 1995 be contained. Three North Shelterbelt Project played an indispensable protection and control effects on the ecological environment of the well-kown Horqin sand production, farming and animal husbandry.