Bosidian Cu deposit in Eshan, Yunnan is a typical effusion -hot brine sedimentary Cu deposit in Middle Proterozoic Kunyang Group Luoxue Formation of S section of Yimen Cu metallogenesis area, Yunnan. The study of the geological feature of ore deposit and control factor of metallogenesis has the guide significance in the prospecting working in S section of Yimen Cu metallogenesis area.