Abstract: Cuninghamia Ianceolata Hook. Is an important timber tree in China and has been widely planted in subtropical region of China at least over 500 years. However, a very large part of the Chinese fir has been planted in unsuitable sites in recent years, as a result, many of the stands are of poor growth. Therefore, it is of special significance for us to investigate the climatic regions for Chinese fir growth areas, so as to study the potentiality for the production of Chinese fir in different areas. At the same time, the suitable areas for producing commercial timber should be determined, the principle of culture practice provided too.The principle of component analysis (PCA) has been applied in this study. Seven variables of water and heat factors relating to growth of Chinese fir have been chosen from 131 weather stations within the range of Chinese fir, ie mean annual temperature, average january temperature, average july temperature, the months of mean month temperature above 15℃, the months of mean month temperature 20—26℃, arerage annual precipitation, months of month precipitation below 100mm. And computation was done by electric computer. Results of PCA are shown clearly to have discontinuous 6 groups and its two dimensional ordination by PCA can attain 74% of the total information content. Accordingly, the range of the Chinese fir is divided into three zones and six regions, namely, eastern region of northern zone, western region of northern zone, eastern region of central zone, middle region of central zone, east-southeast region of central zone, and only one region of south zone. The productivity of Chinese fir varies notably in different zones of regions.