Abstract：The Da'ao intrusion-type tungsten-tin deposit is hosted in the Jinjiling composite granite body. The paper discusses the genesis of the deposit and preliminarily summarizes the metallogenic model of the deposit according to the geological setting and characteristics of the deposit and results of Pb, S, C and O isotopic analyses of granite and ores. The deposit formed by the polyphase tectonic movements and magmatic pulsation and evolution. The metallogenic temperatures of the deposit range from 260 to 320℃, the salinities of ore-forming fluids range from 0.88% to 11.22%, the pressure is 862×105 Pa and the depth is 2-3 km. So the Da'ao tungsten-tin deposit is of intermediate- and high-temperature metasomatic origin.