Abstract: It is a developing tendency to divide site quantitatively with considering comprehensive polyfactor. The grading combination of the dominant factors of site in some regions is a simple, precise and effective method, the key of which is the determination of dominant factors of site. The relationship between dominant height of main tree species (populus spp. and Ulumus pumila) and site factors such as landforms, soil fertility, etc, has been analysed with the linear model theory in 17 townships of Chaoyang, Jianping, Kazuo and Beipiao Counties in the west Liaoning province. The landform, position of slope and soil depth are considered as dominant factors of site in hilly areas. The farmland shelterbelt site was divided into 3 classes in the region according to geomorphic unit. Then, combining the gradations of slope position and soil depth with 3 classes, 6 sub-classes were classified. At last, the suitable tree species were selected for each site types, and its suitability was evaluated quantitatively.

Key words: Farmland shelterbelt, Site type, Evaluation ofsitequality, Multivariate statistical analysis, Linear model