| Based on geologic investigation in the field and a lot of analysis data in the laboratory, this paper has studied the regional geology and structure background of Baiyangping silver and polymetallic deposit, and also studied ore deposit geology, isotopic geochemistry, rare earth element geochemistry, trace elememnt geochemistry, inclusion, solution geochemistry, process of the ore-forming geochemicstry, etc.. The result is that:(1) Baiyangping silver and polymetallic deposit located the northern of Lanping Basin. The complicated regional geology and structure evolvement offer advantageous geological condition for ore-foming.(2) The source of ore-forming material was came from depth, had the crust-mandle mixed characteristic. The water of solution was groundwater supplied by atmosphere precipitation.(3) The Baiyangping deposit, the Jinman copper deposit and Himalayan alkali rich intrusive bodies have the similar elements combination.(4) The REE patterns of vein minerals show an enrichment of middle REE.(5) The chemical quality of solution was acidity, belong to Na+-Cl- solution.(6) Auxiliary agent of ore-forming elements was mainly CO2, and mineralizing agent was Cl-, and all of them were came from the crust-mantle.(7) The ore-forming elements in the solution was transported by CuCl0, CuCl2, AgCl0, AgCl2- and so on.(8) The process of ore-forming was a process of temperature and pressure falling. The T, P was lower, Eh, fO2,fS2 was lower too, pH was rise.
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