The mountainous area in eastern Liaoning Province is one of timber forest bases in china. The conditions, such as humid climate and fertile soil, in this area are favorable to the growth of manchurian walnut. In order to realize the rule of "proper trees in proper sites" and to manage them properly, we were engaged in studies on the quantitative classification of the monchurian walnut plantation site types.At first, the site factors closely related to the site types were selected, a multivariable mathematic...