Dianfang Au deposit is located in Songxian, Henan Province. The fact that δ34S value is 3.4~5.9 with low dispersion suggests the metallogenic material is a mixture of things coming from the mantle and the lower crust after a process of homogenization. The study on Pb isotope shows that metallogenic Pb comes from the mantle and lower crust. Combined with study on tectonic pathway and shape of ore bodies, it is predicted that concealed rock mass exists in deep part of southeastern periphery of explosive breccia in the mining area.