Magmatic rocks of various periods and types, though different in absolute contents of chemical components, exhibit certaih genetic corrections in their inner structures of data Set.Using variation matrix analysis, subcompo}ition analysis and principal component analysis which all belong to the statistical analytic methods of compositional data, the present paper has studied the affinity of different typca of magmatic rocks formed in Variscaz:, Indosinian and Yanshanian periods in Ganze-Daofu area and, furthermore, dealt tentati- vely with their genetic connections.