通过对杉木不同造林密度试验林连续三年观测分析结果可知，密度与生长量呈极显著负相关，但对生长节律没有影响。杉木年生长过程划分为三个阶段：前期、中期、后期。影响高生长的主导气象因子是降雨量，其次是气温；影响径生长的主导气象因子是平均气温，其次是降雨量。采用数量化理论（Ｉ）建立了杉木树高和胸径旬生长量预测模型。 Through the three years of continuous observation and analysis of different planting density test forests of Fir, we can see that there is a significant negative correlation between density and growth, but no effect on growth rhythm. The annual growth of Cunninghamia lanceolata is divided into three stages: early stage, middle stage and later stage. The main meteorological factors that affect high growth are rainfall, followed by temperature; the dominant meteorological factors that affect the growth of the diameter are the mean temperature, followed by the rainfall. Based on quantitative theory (I), a prediction model of tree height and DBH growth was established.