The present paper deals with the subdivision of degree of soil alkalinization in Huang-Huai-Hai plain, the conclusions are summarized as follows:1. If the soil samples collected are typical and representative, the analytical data are reliable and variables selected (property indexes)are suitable, the application of "the analytical method of synthetic numerical value" in subdivision of degree of soil alkalinization may be realized satisfactorily. 2. Based on the major items and specific indexes suggested by the authors, the alkalized soils in Huang-Huai-Hai plain are subdivided into 4 grades, namely, tile alkali soil, strongly alkalized soils, moderately alkalized soils and weakly alkalized soils. The standards for subdivision of the alkalized soils are given in tables 2. According to the equation.