Abstract: The genesis of Yemaquan iron-polymetallic deposit was defined as skarn-type.The author found appearance of exhalative rock and jasper rock on the top of ore deposit which give evidence to exhalative-sedimentary mineralization.By analysis of comparison,the author considered that there is exhalative-sedimentary mineralization on the early stage,and on the later stage is skarn-type mineralization,so the orig in of Yem aquan Fe-Cu deposit should be exhalative-sedimentary and skarn-type.This may have some importance in theory on prospect in Qimantage region.