Abstract:According to a lot of plot data, the productivity distribution patterns of Chinese-fir plantations related to geographical or hydro-thermal factors were clearly indicated. The geographical distribution model established here objectively reflects the geographical patterns of the high-yield Chinese-fir plantations. In terms of the ecological limitation rule, the optimal models of Chinese-fir productivity vs. hydro-thermal factors were set up, showing that the hydro-thermal factors ,which are most suitable for Chinese-fir growth ,are as follows: annual mean air-temperature 16～17 ℃ , annual precipitation 1700～1900 mm, warm index 145～150 ℃ month, Thornwaite’s potential evapotranspiration 920～930 mm. Under the climate conditions, the productivity of Chinese-fir plantations can be up to 17～18 t·hm-2·a-1 for arbor layer and 21～22 t·hm-2·a-1 for the whole forest.