Abstract: Through the flow sand of Kubuqi sand, semi-fixed sandy land, fixed sandy land, and planted Astragalus adsurgens and Hedysarum laeve vegetation in soil enzyme activities to study, results showed that, fixed sandy land, and semi-fixed sand soil protease, urease, invertase activity than the flow of sand to increase the range of 6.73%-59.09%, fixed-sand activity the most, followed by semi-fixed sandy land, flow sand activity of the weakest. Polyphenol oxidase in the fixed sandy land and semi-fixed sandy land than the flow of sand are on the decline. Artificial vegetation, soil protease, urease, polyphenol oxidase and invertase activity than the natural vegetation were increased by 23.41%, 37.10%, 7.96% and 47.41%. Soil protease and invertase activity in the summer, the largest, urease activity of the largest in the fall, polyphenol oxidase activity in the spring and winter big. Protease, urease and invertase in the soil layer 0-2 cm activity is large, polyphenol oxidase activity at 0-20 cm soil layer did not change significantly.