The statistical values of various properties of the soils developed on pluvial-alluvial and alluvial plains in South Xinjiang were obtained by analytical method of synthetic value (AMSV) on the basis of large amounts of data of soil properties, which is helpful for comprehension of the characteristics of the soils in the region. Simultanously, the principal composition equation, scattered point graph a.nd indexes of interclass delimitation of soils in the region were obtained, which provides the possibility for correction of the existing soil classification system of the region. Results from 32 profiles showed that the results obtained from this approach could be used as the reference for the classification of the soils in the region.This classification has also been proved advantageous not only to discriminate the soils from the data of field survey or remote sensing, but also to determine the poAssibility of soil improvement. It was showed from the results obtxined that all residual saline soil was not suitable for reclamation.In addition, the indexes of interclass delimitation for saline and salinized soils in the region are discussed. Five factors including salts in whole profile (0-100 cm),Na⁺, salts in surface soil (0-30 em),Cl^- and salts in subsoil (31-100 cm)were used as the indexes in which salts in whole profile, Na⁺ and salts in surface soil are oonsidered as the more important indexes.