The process of iron and sulfur reduction mediated by S. oneidensis and As(V) adsorption performance in alkaline anaerobic environment were studied by cyclic voltammetry(CV), Fe L-and S K-edge XANES and inductively coupled plasma spectrometer(ICP). The results showed that, riboflavin could promote process of iron and sulfur reduction mediated by S. oneidensis, and the electron transfer process was acetate→ riboflavin → substrate;elemental sulfur and jarosite were gradually reduced after 24 h of S. oneidensis...