Abstract: The Houxianyu boron ore field, tectonically located in the west end of the Yingkou-Kuandian paleo-uplift of Eastern Liaonign anteclise, North China platform, is a part of the East Liaoning-South Jilin boron metallogenic belt.The studied area is essentially covered by migmatitic granite, which was regarded as magmatic rock by previous researchers.By the study and regional comparison of the distribution, lithology, petrochemistry and geochemistry of the rock, the authors consider that the migmatitic granite is formed by sedimentary metamorphism.It is a normal metamorphic stratum, but not magmatite.There probably exist stratabound boron ore bodies beneath the rock.The drilling test has proved a buried boron ore body under the hundreds meters of thickness of the migmatitic granite, making a breakthrough in the exploration and adding the potential of prospecting in the area.