Abstract: The microstructure of nanoslice of Bismuth Oxyiodide （BiOI）was synthesized by solvothermal method at lower temperature.The photocatalytic degradation performance of BiOI on Penicillin under the visible-light-driven was studied.The scanning electron microscope （SEM）test found that the product is microspheres with uniform sizes.The product possesses good crystallinity in the X-ray diffraction（XRD）test.In addition，it was found that the BiOI product can effectively remove Penicillin in the water under the visible-lightiven.