Abstract: Bismuth iodide/Graphene oxide（BiOI/GO） photocatalysts were prepared by organic acid assisted regulation and low temperature liquid phase precipitation. Structure of BiOI/GO photocatalysts were characterized by FTIR, FESEM, Raman and XRD. The results showed that the photocatalytic degradation of methyl orange dye by BiOI/GO photocatalysts was 96.8% in the first time and 81.2% in the fifth time. XRD showed that BiOI/GO photocatalysts were mainly composed of BiOI with high crystallinity. FTIR preliminarily showed that BiOI/GO photocatalysts had the characteristic absorption peaks of graphene oxide and BiOI. Raman spectroscopy showed that BiOI/GO photocatalysts had the composition and structure of graphene oxide. FESEM indicated that the BiOI/GO photocatalysts were in the shape of sheet or layer, and the graphene oxide was covered on the BiOI catalyst surface in the form of thin paper.