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Due to the large shafts(d≥500 mm) own characteristics, the existing cylindricity measuring instruments and measuring devices are Unable to meet its cylindricity measurement environment and requirements, The cylindricity measuring of large shafts parts become constraints growing industry of oil, paper, casting. Based on the recent Polish Kielce University of Technology V-block method proposed by the in situ measuring device for large shafts, the in situ device will collected signal measured by the data acquisition card in Labview software platform on data analysis and processing, the final value of the measured results of least squares cylindricity,and thus validate the V-block method in place to measure large shafts feasibility.