Abstract: The correlation among the attrition degrees of the teeth was studied on 880 cases from Liaoning province in China. "Correlation matrix table on the attrition degrees of the teeth", which was obtained by applying the Theory of Quantification Type Ⅳ and the computer Science, showed obviourly a close relation among the attrition degrees of the teeth, and solved the problems caused by the missed, the injured, the filled and the dental caries whose attrition degrees of the tooth could not be judged in the past. At same time, it more accurately provided the scientific method to replace the attrition degrees of the incomplete tooth.The statistical analysis was given from 1 to 4 tables. The results are as follows: 1. The sequence of correlation on the attrition degrees of the respective tooth: first, the near tooth in the same name tooth group on the same jaw; second, the same name tooth in the opposite side on the same jaw; third, other teeth. 2. The correlation on the attrition degrees of the same name tooth groups on the same jaw: for the upper jaw,the sequence is molars,premolars,incisors,canines; for the lower jaw, molars, incisors, premolars, canines. 3. The sequence of correlation on the attrition degrees of the same name tooth groups on the opposite jaw is. molars, premolars, canines, incisors. 4. The sequence of correlation on the attrition degrees of the different name tooth groups is: molars and premolars, premolars and canines, canines and incisors, molars and canines, molars and incisors, premolars and incisors.