Abstract: In this research, took Cunninghamia lahceolata plantation in different elevation in Dawei Mountain as object, set 14 transects, which include 152 sample plots, and construct a structural equation model of forest growthsite factorstand density factor. The result showed that the greatest impact stems from stand density factor with -0904,and has no indirect effect. The site factor affects forest growth with 0264 as total index, but only 0.018 as direct influence.It suggests site factor is mainly limited by density. Result of suitability test showed that the fitting effect of model and actual data is well,so it could provide some help for practical production. According to the result,it advise planting Cunninghamia lanceolata under the attitude of 1 100 m, control the numbers around 1 500 trees/hm2,and thinning timely. These measures may help to access to manage purpose and economic performance in a short time.