A usual discriminant analysis method-Fisher’s discriminant analysis is introduced. Based on Hefei-Liu’an-Yeji Expressway Project

sampling soil’s discriminant analysis of swelling potential ultilizing the software of SPSS is conducted

discriminant equation suiting for the district is obtained; and several conclusions are drawn as follows:(1) Only several basic physical indices are acquired in the analysis

the operation of which is popularization and standardization. Lots of advantages such as easy test condition

simple facility and short periodic time can be obtained and a correct classification can be done on the basis of statistics. (2) The value of coefficient of plastic index is maximum

which means that discriminant equation is sensitive to plastic index and that plastic index can reflect swelling potential to a well extent. (3) It is easy and efficient to do discriminant analysis making use of SPSS

statistic significance of classifying is explicit and it can provide grounds for the discriminant of expansive soil. Tests for the equation are carried out and from which we can see that it has good prospect for the identification and classification of expansive soil.