In order to scientifically assess the implementation effect of the enclosed protection area for desertified land in Gansu Province，the Gansu Desert Control Research Institute has used satellite remote sensing，ground automatic stations and manual sample-plot survey to carry out ecological benefit monitoring and prepare a phased assessment report. The main results include：（1）In the 7-8 years of closure and prohibition，84.79% of ecosystems in the protection areas have been improved，the biological crust of semi-fixed and fixed sandy lands in the central and southeastern closed protection areas of the Hexi Corridor has increased by 4.45%，and the ecological service value has amounted to RMB 5356.6191 million per year，with each enclosed protection area of RMB 446.3849 million per year. （2）The plant species，diversity index，density，coverage and average height have increased in the improved enclosed protection areas；and appropriate auxiliary restoration can rapidly improve the vegetation restoration effect in enclosed areas，significantly reduce the thickness of wind erosion and sand burial in enclosed areas，the annually average sand accumulation，the content and volume weight of fine and coarse sand in the surface soil，and improve the soil organic matter. （3）The closure and prohibition have affected temperature difference，wind speed and humidity，and been meaningful to stabilize the microclimate environment situation. （4）It is necessary to optimize and improve the monitoring program in a long time；and use the monitoring results to guide and promote the closure and prohibition.