Abstract: There are lots of Yanshanian granitoid stocks related to molybdenum-tungsten mineralization distributed in the southern part of Luanchuan County, Henan Province. According to their mineralizationintensity, geological and geochemical characteristics, these stocks can be divided into three groups. The firstgroup of rocks, with relatively high SiO2, K2O, Rb contents and K2O/Na2O, Rb/Sr ratios as well as relativelylow Al2O3, FeO, CaO, Na2O, Sr contents, are associated with super-large size W-Mo ore deposits and has welldeveloped molybdenite-quartz veins. In the upper part of these stocks the crenulate quartz layers occur. The second group of rocks, with medium SiO2, K2O contents and K2O/Na2O ratios, are related to some medium orsmall W-Mo deposits and molybdenite-quartz veins are less developed. The third group of rocks, with low SiO2,K2O, Rb contents and K2O/Na2O, Rb/Sr ratios as well as relatively high Al2O3, Na2O, Sr contents, are almostbarren and quartz-veins are least developed. Investigation shows that the magma-differentiation and evolutiondegree of the stocks have close relation to mineralization intensity.