Abstract: According to sand accumulation condition in ridge and furrow and wind erosion in cropland, five plots with different desertification degree (non-desertification, weak desertification, moderate desertification, serious desertification and extremely serious desertification) were carefully selected to study the effects of desertification on the soil properties and crop production in Minqin oasis, southeastern fringe of the Badanjilin desert. The results showed that, the desertification of the farmland lead to the soil coarsening, nutrient loss and hence the decreasing of the crop yields. Comparing with that without desertification, the content of clay, organic matter, soil water contend, total nutrient, rapidly available nutrient, electrical conductivity, pH value and crop yields decreased by 27.3%, 29.78%, 24%-39%, 1.9%-46.8%, 63.4%, 3.8%, 0.98-52.2 g, respectively, in the farmland with extremely serious desertification. And also, the soil surface temperature increased by 6℃. The study suggested that the effective sand control projects, such as the farmland shelter-belt, will benefit the farmland yields in the oasis.