Abstract: In the paper the genetic mechanism and genetic types of magmatic rocks at the northern foot of the Dabie Mountains are dissusced through studies of their mode of occurrence, petrology, petrochemistry, accessory minerals in the artificial heavy fractions, isotope geochemistry, relations of their distribution to plate tectonics and ore potentiality of various rock types. The the direction in ore prospecting is pointed out. In discussing the above-mentioned problems, the mode of occurrence, distridution and petrological characteristics of various rock types are regarded as the basis. Typical rock masses were selected to make mathmatical statistics in respects of petrochemistry, accessory minerals in aritficial heavy fractions, isotopic ages and ore potentiality. On this basis, by use of new theories and methods and in combination with an analysis of the structural setting and temporal and spatial relations of distribution between magmatic rocks of various ages in the area, a reasonable genetic classification is proposed for the magmatic rocks in the area. The auhtor considers that the magmatic rocks in the area are mainly of crustal anatectic crystallizationintrusion type （70％）, magmatic crystallization contaminaation type （28％）and mantle-derived type （2％）.