|Abstract:The Qian’an iron ore concentration area is a typical Precambrian BIF enrichment area and also an important raw material base for iron ore. In recent years, the proven reserves have been declining continuously, so it is urgent to carry out deep iron resources prospecting work. 3D geological modeling based on geological and gravity-magnetic data integration, under the guidance of geological theory, is an important method and frontier of mineral resources exploration and assessment in the world. Qian’an iron ore concentration area is taken as the study area. Based on geological and gravity-magnetic interpretation data, we established 3D geological model of Qian’an geological map (1:50000). Then guided by regional metallogenic theory and prospecting model, this paper summed up some favorable geological conditions for ore-controlling, and established the quantitative prediction model. By using “cubic predicting model” prospecting method, we delineated 5 predicted targets according to the value of prospecting information. The research results show that the gravity and magnetic anomalies can effectively infer fault structures and iron bearing formations distribution in the ore-concentrating area, which provide support for regional 3D geological modeling. Meanwhile, this research extends the traditional metallogenic prediction method to 3D space, which can provide reference for prospecting work in the deep and peripheral area.