In order to reveal the effect of super absorbent polymer of nano carbon and soil microbial community structure on citrus yield,field experiment was conducted in the citrus orchard in Wanzhou,the Three Gorges Reservoir Area.Conventional fertilization(ZJ1)was used as the control.The optimum application rate of Nano carbon(A),Aquasorbfertilizer(B)and compound fertilizer(C)on citrus yield was determined by orthogonal experiment.Simultaneously,soil bacterial community structure under different fertilization treatments were analyzed based on Hiseq 2500 Highthroughput sequencing method.The best fertilization combination for citrus yield was(ZJ5)A2B1C2;the microbial diversity was most influenced by the compound fertilizer,followed by Nano carbon,and the effect of Aquasorbfertilizer was the minimum.It was found that the relative abundance of Actinbacteria was the highest in the optimum fertilization combination(ZJ5),and Verrucomicrobia was the lowest.It was found that the order of environmental factors which affecting the microbial community change were pH> organic> hydrolyzable nitrogen.