Abstract: Based on measurements of net photosyn thesis (NP),stomatal resistence (RS) and transpiration (TR),the vesults showed that there existed similar physiological characteristics among some species of conifer. This implied that physiological requirements for environmental conditions, in which some species of conifer were grown, are identical. By the analysis of fuzzy cluster,eight species were divided into three groups. The first group was characterized by high NS and RS.and low TR,and correspondingly fit for a site with high light intensity, greater CO2 concentration and low water demand; the second was opposite in characters and the last median. so it is necnssary to choose trees suited to the site to get more economical benefit.