[Objective] The stability of soil aggregate in orchard with different planting years in granite eroded poor land was studied to provide scientific reference for comprehensive management of eroded poor land in granite hilly area of South China. [Methods] The composition and stability of soil aggregate in orchards with different planting years (0, 3, 7, 12, 16, 21 years) in eroded area were determined by using Le bissonnais (LB) method in granite hilly area of Southeast Guangxi Zhuang Autonomous Region, and to explore the variation trend of soil aggregate stability with planting years and its influencing factors. [Results] ① With the increase of planting years, soil permeability was improved, cation exchange content, organic carbon content and fine particulate matter content increased, and the soil texture gradually transformed from sandy soil to loam soil. ② Under three different LB methods, the soil aggregate mass percentage of >0.25 mm size increased with the prolongation of planting years, reached more than 65.68% at 21 years, which was 9.18% higher than that of control. ③ The mean weight diameter (WMD) of soil aggregate increased significantly with the prolongation of the planting years. And the RSI, RMI, and k values all decreased to different degrees, meaning that the aggregate stability was improved. ④ The MWD was extremely significantly positively related to soil organic carbon content and clay content. Cation exchange content was significantly positively related to MWD, and sand content was extremely significantly negatively correlated. This showed that the increase of organic carbon, clay and cation exchange content could significantly improved the soil aggregate stability. The content of organic carbon was the main factor affecting the stability of aggregates. [Conclusion] Cutting slope to form citrus orchard can effectively control eroded poor land, and with the prolongation of reclamation years, the soil structure tends to be stable, and then the aggregate stability and the soil quality are improved.