Abstract: The corrosion depths of clubbed and tubular A3 steel in red soil in Lab for 600h and 216h were investigated by monitoring their resistance changes,respectively,and the mass loss for small sized samples of the A3 steel under the same conditions at different intervals was also measured for comparison.The results showed that obvious local corrosions occurred on the clubbed and tubular A3 steel,and their corrosion rate increased at a high rate at initials,and then at a slow rate with time increasing.The corrosion depths resulting from mass loss were consistent with those calculated from resistance changes.Besides,the clubbed and tubular A3 steel in red soil in Lab had coincident corrosion depths evolution,indicating the feasibility of monitoring the corrosion depths of alloys in soils and other special environments by continuously measuring their resistance changes.