Abstract:The paper presents a study of the electrochemical property,open circuit potential(OCP),and its relationship with the biomass(measured with polysaccharide and phospholipids) of biofilms.Scanning electronic microscopy(SEM) was used to characterize the biofilm morphology.In addition,the biofilms were treated with UV rays.The results show that certain OCP value variation period is consistent with the biomass increasing on stainless steel surface,and OCP can be an available parameter for biofilm characterization.Biofilms are resistant to UV rays and can not be removed easily after formation.