Abstract: The effects of two intercropping modes after high-intensity thinning (70%) on the plant conservation function were studied in Fengtian State owned Forest Farm in Anxi County in 2023.The results showed that:①the intercropping of various Castanopsis hystrix + Fokienia hodginsii and Michelia macclurei + Liquidambar formosana models increased the number of plant species and individuals in different layers to varying degrees,and effectively promoted the regeneration and development of understory shrubs towards the tree layer,the understory species and individual numbers are the highest in the thinning intercropping model of Michelia macclurei + Liquidambar formosana,and their species richness and diversity are also at a high level;②both intercropping modes promoted the growth of Pinus massoniana plantation,among which the intercropping mode of Fokienia hodginsii and Castanopsis hystrix had the highest tree height,diameter at breast height,and individual biomass;③there were significant differences in the growth of different intercropped tree species,among which the height,diameter at breast height,and individual biomass of Michelia macclurei and Castanopsis hystrix are significantly higher than those of Fokienia hodginsii and Liquidambar formosana.In conclusion,intercropping Michelia macclurei and Castanopsis hystrix is a better choice under high-intensity thinning of Pinus massoniana plantation.