The analytic method of synthetic numerical value is a mathematical method in which the principal composition analysis and the discriminatory analysis are integrated into a single combination. In experiment of classification of soil spectra, with this anethod, not only the soil samples can be divided into different types by calculation, but also the delimitation index of various soil properties (reflectivity,of wave band ρΔλ)can be calculated. Therefore, it may be regarded as the method with a bright prospect in the practice and research of soil classification. In the application to the subdivision of alkaline soil, this method exhibits its simplicity and reliability to a larger extent. The results obtained in the experiment of subdivision of alkaline soil by this method may be useful for the classifying the alkaline soils of Huang-Huai-Hai plain into 1 over categories. The basic concept of analytic method of synthetic numerical value, in addition to its application in soil classification, may also provide a way for processing the data involved in spectrum reflective characteristics of soils and may be possibly used in the soil classification and identification of remote-sensing image as well.