Abstract: To further investigate the assisting effect of micro-electricity on high strength organic matters in an anaerobic baffled reactor(ABR), the influences of electrode slide position on COD_Cr removal, VFA component and microbial community structure were compared and analyzed. Temperature, hydraulic retention time (HRT) and influent COD_Cr concentration were controlled around (35±1) ℃, 24 h and 5000 mg/L, respectively. The results showed that the COD_Cr removal rate was as high as 83.19%, about 15.23% higher than that of the control group, when the electrode slide was placed in the first compartment.The corresponding concentration of acetic acid increased by 23.26% and propionic acid decreased by 78.09%, compared with the control group, which indicates that the micro-electricity enhanced the degradation rate of propionic acid through stimulating activity of hydrogen-producing acetogens. The concentration of propionic acid increased 4.2 times when the electricity slide was placed in the second compartment, indicating that the micro-electricity significantly stimulated the activity of hydrolysis fermentation bacteria. Finally, the similarity of the microbial community in every compartment in the electric-assisting ABR experiment was below 70.0%, indicating that the micro-electricity affected the distribution of the microbial community and increased the production of some functional microbial species.