Synthesis of stand biomass data of 4 typical forests (Cunninghamia lanceonata forest, Pinus massoniana forest, deciduous broadleaved forest and evergreen broadleaved forest) from National Forest Inventory in subtropical area, we determine conversion parameters for stand biomass estimation based on stand volumes and analyzed how stand characteristics affect the parameters. The results showed that: (1) The mean values of wood basic density (Wd) of dominant trees of Cunninghamia lanceonata forest, Pinus massoniana forest, deciduous broadlea...