The Dong’an alkali feldspar granites located between the Songnen and Jiamus massifs, and the key transitional region from SenoAsia tectonic setting to Paleopacific tectonic setting. Through study of LAICPMS UPb Ages, Geochemical Features of the Dong’an Alkali Feldspar Granites in Xunke County, Heilongjiang Province and the Mo—Pb—Zn—Polymetal Deposits for discussing the genesis and formation tectonic setting of Alkali Feldspar Granites, and it can provide proofs for the evolution of the Mudanjian Ocean and the Mesozoic tectonic setting of the Eastnorther China, and it can conclude the rule of metallogenetic Mo—Pb—Zn—Polymetal Deposit in the Lesser Xing’an Range and Zhangguangcai Range.