The effects of biochar addition on aggregate distribution，stability and distribution of carbon and nitrogen in sandy loam soil were studied，which provided theoretical basis for agricultural utilization of biochar and soil fertility improvement. Four levels of biochar application(0，10，20，30 t/hm²)and two levels of nitrogen application(0，150 kg/hm²)were set up to analyze soil aggregates and their carbon and nitrogen contents through 2-year field positioning experiment.The results showed that the distribution of aggregates under different treatments were dominated by >5 and 2～5 mm aggregates. When biochar was applied at 20 t/hm²，>5 and 2～5 mm aggregates accounted for the largest proportion，and the total proportion was 58%，which increased by 20% compared with that without biochar application.The average weight diameter and geometric weight diameter of soil aggregates with 20 t/hm² biochar application increased by 17.6% and 24.3%，respectively，compared with that without biochar application(P<0.05).The change trend of organic carbon and total nitrogen was consistent.After biochar addition，the contents of soil organic carbon and nitrogen increased，and the contents of organic carbon and nitrogen in aggregates of different grain size increased by 27.9% and 28.9%，respectively，compared with the control，and the contents of organic carbon and nitrogen in aggregates of <0.25 mm grain size were higher. The addition of biochar significantly increased the content of soil macroaggregates and improved the stability of soil aggregates. The contents of soil carbon and nitrogen and the contents of soil aggregate carbon and nitrogen increased significantly. The addition of biochar increased the contribution rate of organic carbon and nitrogen in >5 mm aggregates.Under the experimental conditions，the addition level of biochar at 20 t/hm² was beneficial to soil fertility improvement in wheat field in the irrigated area of northern XinJiang.