Abstract:By using modified logistic model, the growth rate for basal area of dominant populations was studied in semi-natural mixed forest in Fujian Province. Among populations in communities Cunninghamia lanceolata I Alniphyllum fortunei I Castanopsis carlesii ( I ), Cunninghamia lanceolata I Castanopsis fissa I C. carlesii ( II ), Castanopsis carlesii I Cunninghamia lanceolata (Ⅲ), and Cunninghamia lanceolata / Alniphyllum fortunei / Castanopsis carlesii / C. fissa (IV), community IV had best growth rate for Cunninghamia lanceolata，showing that the more dominan t broad-leaved tree species dominated in mixed forest the better the C．1anceolata grew．In com un ity with dominant broad—leaved species not more than three，maximum growth rate for C．1anceolata appeared at 4-6 cm dbh，while that more than three，at 8-10 cm dbh．The growth rate for C． 1anceolata in the four com unities was in order in IV>II>I>Ⅲ.