The effects of SRB on macrocell corrosion of X70 steel in soils were studied by using polarization curve technique, electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM） and EDXA. It was noted that the SRB obviously affected the macrocell corrosion behavior of X70 steel. When X70 steel formed a macrocell between inoculation SRB or bactericide clay and sand, X70 steel in clay was an anode, while that in sand was a cathode. Along with test going, the corrosion rate of X70 steel, which was buried by natural style,was slow, but the anode of macro cell kept a rapid corrosion rate. The corrosion rate of X70 steel in clay was faster than that in natural condition. Current density and electromotive force of macro cell of X70 steel formed between inoculation SRB clay and sand was much larger than that between bactericide clay and sand. The corrosion rate of anode in inoculation SRB clay was 4. 93 times of that in natural condition. The corrosion rate of anode in bactericide clay was 2. 45 times of that in natural condition. When the area ratio of cathode to anode being 15：1 ,the corrosion ratio of anode in inoculation SRB clay and bactericide clay were respectively 5.01 and 2.33 times respectively of that in condition of the area ratio of cathode to anode baing 1：1.
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