Abstract:Based on the extensive data collection of phenology of Chinesefir(Cunninghamia lanceolata Hook.), geographical variation of phenological phases in Chinese fir was analysed and it was found that there was a correlation between the productivity, and growing period. The main results were asfollow: (1) the indication of geographical variation of phenological phases of Chinese fir, and the establishment of mathematical models of mainphenological phases patterns of geographical variation of Chinese fir.(2)demonstration that there was a square curve correlation between length of growong period and productivity, when the length of growing period was in anarrange of 200 to 250 days (mid-zone), the productivity was higher, resching 8-18 t/ha.a; while the length was more than 250 (in south-zone) or less than 200 days(in north-zone), the productivity was lower,only 3-8 t/ha.a.These rgsults were effected synthetically by eco-genetic characteristics of Chinese fir and the environmental conditions.