Abstract: 【Objective】 This project aims to study the effect of biochar on the improvement of irrigated wind-sandy soil,which might be of great practical significance to the agriculture of biological carbon. 【Method】Experimental soil was the irrigation sandy soil, and experimental material was the wheat biochar. The fixed field experiment included four treatments: 0, 67.5, 112.5, and 225.0 t/hm². Corn yield was determined in the late growth stage of corn. The soil was collected, and relevant nutrient indicators were analyzed. 【Result】The results of seven years experiment showed that, compared to the control, application of wheat biochar had no obvious effect on pH value in the irrigation sandy soil of 0-20 cm and 20-40 cm layer. Application of wheat biochar significantly increased the contents of total N, organic matter, available N, and available K. This method increased respectively by 14.5%～29.6%, 48.9%～89.5%, 28.7%～93.5%, and 6.9%～31.3% in the 0-20 cm soil layer., and increased respectively by 38.1%～56.0%, 24.9%～40.1%, 30.8%～68.1%, and 15.6%～45.2% in the 20-40 cm soil layer. Application of wheat biochar could increase significantly corn yield by 28.7%～49.2%. 【Conclusion】Application of biochar in the irrigation sandy soil could increase soil fertility, thus increasing the crop yield.