It is common accepted by many archaeologists today that we should strengthen the investigation of ration in the study of archaeology. The precondition of the investigation of ration is introducing into mathematical method. The basis of typology study in archaeology is classification, discriminating type is classification and discriminating pattern is also classification. But the principle and intention is different. The most essential intention of classification is beating out different relations as well as their degree of similarity and dissimilarity of the study objects. However, mathematics is a subject researching the relation among objects, so that classification itself is a kind of mathematical behavior.This paper has used the datum from excavation in graveyard at Qiao Village, Houma City, Shanxi Province from 1963 to 1993.