Pyrite is the major gold-bearing mineral in the Jincheng gold deposit. According to the comprehensive identification under microscope, the formation characteristics and mineralogical characteristics, the pyrite from the No.Ⅱ ore body were discussed. The thermal characteristics of pyrite of the same generation has a positive vertical zoning trend in space, indicating that the composition of pyrite in this ore deposit is complex, suggesting the features of the superposition of multi-stage hydrothermal solutions. The study of the erosion depth of the ore bodies in central location suggests that there still exists good prospect for concealed gold ore bodies.