Abstract: In order to study the adaptability of economic tree species to environment of the dry valley in the upper Minjiang river, 13 physiological and biochemical indices of 11 tree species were determined. Subordinate function values analysis, grey relational analysis and clustering analysis were used to evaluate comprehensive adaptability of tree species and select evaluation indexes. The results showeded that: (1) Weight comprehensive adaptability index (WCAI) of each tree species was ranked as Amygdalus communis L. > Amygdalus tangutica (Batal.) Korsh. > Pistacia chinensis Bunge > Cotinus szechuanensis > Corylus heterophylla > Acer fabri Hance > Lycium ruthenicum Murr. > Armeniaca mume Sieb. > Hippophae rhamnoides > Juglans regia L. > Lycium chinense Mill. (2) G_s、C_i、T_r、P_nmax、SOD、CAT were closely correlated with the comprehensive adaptability of tree species, which could be used as the key evaluation indexes of economic tree species screening in the upper Minjiang river dry valley.