Abstract: Depending on the parallel observation of growth quantity of middle and young China-fir forests with their corresponding meteorological elements and using analytical method of grey system,analysis showed that: 1 change of the precipitation, the sunshine time of decade and the days of decade maximum air temperature≥30℃ in mountain of Hunan province is not close related with the growth of China-fir forests; 2, decade mean of air temperature, its maximun and minimun, and relative humidity is close related with the growth of China-fir forests.