Abstract: The same forest management measures were taken for the same age mixed forest with Castanopsis hystrix+ Acacia crassicarpa and the pure forest with dividend cone in the control forest, and the dynamic changes and differences in tree growth, soil pH value and soil nutrient content of the two stands were monitored at the age of 16～22 years. The results showed that the height and diameter growth of all tree species increased year by year from the 16th to the 22nd year in mixed and pure stands. The stand age was16～19 years, and the stock per unit area of Castanopsis hystrix and Acacia crassicarpa mixed forest and red cone pure forest increased year by year. The stock volume per unit area of mixed forest and pure forest decreased when the forest was intercut for 20years. In 21～22 years after thinning, the stock per unit area of mixed forest and pure forest increased year by year. The accumulation per unit area of pure Castanopsis hystrix forest increased faster than that of mixed forest, and was 34.7% higher than that of mixed forest at the end of the period. The pH value of mixed forest was higher than that of pure forest, indicating that the acid lowering ability of mixed forest was better than that of pure forest. The soil fertility of mixed forest is higher than that of pure forest.