Based on enzyme induced calcium carbonate precipitation (EICP) technology, plant urease was used to improve and strengthen desert aeolian sand. In order to find a cheap and simple urease extraction method, potato was used as the raw material, deionized water, glycerol aqueous solution and ethanol aqueous solution were used as extraction solution, and the plant urease in potato was separated and extracted by crushing, refrigeration and high-speed centrifugation, so as to study the influence of different extraction solutions on the extraction effect of urease; The results showed that the best of the three extracts was ethanol solution. When the solid-liquid ratio was 1:6 and the concentration of ethanol solution was 30%, the urease activity value was the highest and the extraction effect was the best. In the improvement experiment of aeolian sand, a hard crust is formed on the surface of the specimen and is of high compressive strength, and the unconfined compressive strength increases gradually with increase of cycles of soaking urease.