Abstract: Shewanella oneidensis MR−1 was synthesized from reduced GO by Shewanella oneidensis MR−1. Reduced GO composites were characterized by transmission electron microscopy (TEM), X−ray diffraction (XRD) and X−ray photoelectron spectroscopy (XPS), and the catalytic effect of photocatalytic degradation of crystal violet was studied. The results showed that the rod−like microorganisms were coated with rGO films to form composites. Under the Rcondition of anaerobic, visible light can promote the decolorization efficiency of crystal violet. Meanwhile during the process of degradation of crystal violet, the photocatalysis and the biodegradation mechanism of Shewanella oneidensis MR−1 of coupled reduced GO were proposed, which provided new insights for the degradation mechanism of biophotocatalytic degradation system.