Located in the Trans-North China orogen, Jingangku deposit constitutes stratabound VMS and BIF. This paper researches on the geological and geochemical characteristics of Jingangku deposit, and studies the paragenetic association of VMS-BIF as well as metallogenic geodynamic model. The stratiform, stratiform-like and lenticular ore bodies are hosted in the Jingangku Formation of Wutai greenstone belt, with the wall-rock of magnetite quartzite, amphibolite, plagioclase schist and mica-quartz schist. The main metallic minerals in the ore are pyrite-chalcopyrite-pyrrhotite-magnetite, which display hypautomorphic-xenomorphic granular textures, and massive or banded structures. The wall-rock alterationis characterized by chloritization and sericitization. Geochemical analyses indicates that the protolith of amphibolite is tholeiite, probably originating in island arc setting. LA-ICP-MS zircon U-Pb dating shows the protolith of amphibolite formed at 2 500 Ma, representing the formation age of the Jingangku deposit. Through analyses of fluid inclusions from ore-bearing magnetite quartzite, the component of metamorphic fluid is H2O-NaCl-CO2-CH4±N2±H2. The fluid during metamorphic peak has feature of medium-high temperature （322 ℃～473 ℃） and low salinity （2.2%～6.74%）. Little magmatic hydrothermal fluid superimpose on the metamorphic peak, with character of medium-high temperature （290 ℃～470 ℃） and high salinity（37.4%～55.79%）. The fluid after metamorphic peak has feature of low-medium temperature （225 ℃～302 ℃） and low-medium salinity （4.03%～11.81%）. Sulfide orebodies are closely associated with magnetite quartzite, so it is supposed that both sulfide and magnetite quartzite have the same material source and formation age, and underwent the same history of deformation and metamorphism. Consequently, Jingangku deposit were formed from submarine exhalative sedimentation, then superimposed and transformed by metamorphic fluid.