Abstract: Ruoergai county is one of the most serious regions in land desertification in northwestern Sichuan. In this paper, according to monitoring and provincial pilot projects of preventing land destertification management,researches were conducted on the destertification types, intensity distribution and its causes in this zone. Based on the summaries of desertification control from these pilot projects,assessment was made of desertification expansion trend in this zone and some sand prevention technological modes and control suggestions were also presented to different desertification types in this area.