Abstract: Banchang copper polymetallic mining area which is in Neixiang county of Henan province is located in the middle part of Zhu yangguan-Xiaguan fault zone. Orebody appears in structural altered rocks zone with irregular veined shape. Ore types have two kinds-granite type and altered rock type. Through the determination research of ore-forming fluid, measuring temperature for inclusion, rare earth elements, and in combination with regional metallogenic setting and metallogenic conditions, it shows that the genesis of the deposit should be postmagmatic middle-low temperature hydrothermal deposit. Metallogenic model are as follows: intermediate-acidic magma which was rich in ore-forming elements occurred invasion along Zhu yangguan-Xiaguan fault zone, and because the extrusion action,leading to the stratum of Yanling Gou group-Qinling Formation pitched under, after the magmatic differentiation, high salinity ore-forming fluid extracted the ore-forming elements from stratum in the process of upshifting and precipitateed mineralization in shallow parts.