Abstract：Based on the principle of Mahalanobis distance discriminant analysis，a classification model of engineering quality of rock masses is established，including six indexes reflecting the engineering quality of rock masses：uniaxial compressive strength，P-wave velocity in rock，volumetric joint count，roughness coefficients of joints，weathering coefficients and permeability coefficient of joints. Linear discriminant functions are obtained through training a large set of expansive samples. The results show that the classification model of distance discriminant analysis has excellent performance，high prediction accuracy；and can be used in practical engineering.
