Iron deposits in China include the sedimentarymetamorphic type, magmatic FeTi(V) type, contact metasomatichydrothermal (skarn) type, volcanic rockhosted type, sedimentary type and weatheringleaching type, among which the first type is the most important. Iron deposits of the sedimentarymetamorphic type are mainly distributed in the North China Craton, represented by the Anshan subtype that formed by the metamorphosed Algomatype banded iron formation (BIF). The Yuanjiacun subtype iron deposits in the Lüliang area formed by metamorphosed Superiortype banded iron formation that deposited at 2.384 to 2.210 Ga. The sedimentarymetamorphic iron deposits distributed in the Wuyang and Huoqiu might also be the results of metamorphosed Superiortype banded iron formation, which are deposited at 2. 473 to 2. 468 Ga and ＜2. 54 Ma, respectively. The deposition of banded iron formation is related to the stratified marine environment at the early stage of the transition from anoxic environment to the great oxidation event. The enormous amount of dissolved iron in seawater was partially oxidized and then precipitated in the form of colloids in the shallow marine environment near the redox interface of the stratified ocean. The banded iron formation in China experienced intense regional metamorphism and deformation, and became banded magnetite quartzite, which can be utilized as sedimentary metamorphic iron ore. Highgrade iron ore forms by hydrothermal replacement of BIF, with ironenrichment mechanism including desilicification, iron activationreprecipitation and decarbonization. The Gongchangling highgrade iron deposit formed by desilicification process at 1. 85 Ga, the Qidashan highgrade iron deposit formed by iron activationreprecipitation process at 2. 5 Ga, and the Yuanjiacun highgrade iron deposit formed by decarbonization at 1. 41~1. 34 Ga.