Abstract: Hainan iron ore is a high grade hematite mine with a complicated morphology and reappearance of lapout.During transition process from open pit to underground mining，its hanging-wall ore is exploited by adopting the induction caving with large structural parameter.In order to accelerate the proceeding of mining and control the ore loss and dilution effectively，ore body's distribution and its boundaries should be detected clearly and rapidly.Herein，three-dimensional mining-exploiting combination method is investigated to detect and delineate orebody secondly by utilizing information of the ore rock exposed from mining-exploiting combined engineering of three sublevel，open pit slope and sublevel drilling project.Accordingly，the layout form and rational position of the development project is optimized.Production practice shows that the three-dimensional mining-exploiting method improves the efficiency and accuracy in delineating the ore-body，and ensures the high efficient mining of the hanging wall ore，with better technical and economic effect achieved.

Key words: Complicated morphology, Mining preparation of multiple segments, Sublevel drilling, Three-dimensional mining-exploiting combination, Efficient mining