Abstract: This paper introduces the geotechnical material classifications from the engineering explorations. Because of the complexity and variety origination of different soils, their physical and mechanical properties are usually different and demonstrate strong locality. The classification of the geotechnical material by the flat dilatometer test (DMT) requires the establishment of a classification system for geotechnical parameters. Based on laboratory test data and DMT results and the formula of material index proposed by the current national code, this paper summarizes the classification method and the correlation of rock and soil types in Wuhan area.