The Changning Banded Iron Formation (BIF) Deposit is located on the northern edge of the eastern landmass of the North China Craton, at the southern end of the "Sijiaying—Macheng—Changning" metallogenic belt in eastern Hebei Province. At the end of 2023, a total of 18 iron ore bodies have been delineated in the entire region, and an estimated resource of 565 million tons of iron ore has been explored. At present, there is almost no scientific research data on Changning iron deposit reported in the media. This article conducted geochemical studies on biotite plagioclase granulite, potassic migmatitic granite, and magnetite amphibolite quartzite in the Changning BIF deposit, and LA- ICPMS zircon U- Pb dating was conducted for biotite plagioclase granulite and potassium migmatitic granite. The original rock of biotite plagioclase granulite may be neutral volcanic rock, while the original rock of potassium migmatitic granite may be granite or rhyolite. Elemental geochemical analysis indicates that the formation background of the Changning BIF is closely related to volcanic arcs. The rare earth distribution curve of the magnetite amphibolite quartzite rich in iron ore shows a slight left leaning shape, with obvious positive anomalies in La, Eu, and Y. The Y/Ho ratio is 32.67~48.18, with an average of 37.01, indicating that the iron ore in the Changning area inherits the characteristics of seawater and hydrothermal fluids, and its ore- forming material may come from a mixture of seafloor hydrothermal fluids and seawater. The age of the upper intersection of 15 measuring points of the biotite plagioclase granulite is 2655 ± 44 Ma, which may represent the formation age of the biotite plagioclase granulite protolith; The intersection age of the 12 measuring points on the potassium migmatitic granite is 2516 ± 74 Ma, which may be a reflection of the early PreCambrian tectonic metamorphic thermal event in the North China Craton.