Objective To study and establish the regression equation applied to estimate the main general skull index with the mandible index, in order to recovery the fragmentary skull. Methods Totally 135 adult male mandibles were used for 35 items of measurements, with the physical anthropology measuring method. Suppose the skull index as dependent variables ySUB>1-26/SUB>, and the mandible index as independent variables xSUB>1-9/SUB>, to study the data with frequencies, erosstabs and regression analysis by using statistical software (SPSS 17.0). Results Totally 180 onefactor linear regression equations were established. After the evaluation, it was proved that the equations had statistical value. Therefore, there were 69 partnership equations in condition of EM>r/EM> ≥ 0.40, EM>P /EM>0.001. Conclusion These equations can be used to estimate the main general skull index with mandible index, to provide evidences for the recover