Abstract: A super high-quality roller blank automatic inspection system has been proposed according to the two point method and relative measure theory for production efficiency improvement.The hardware system adopts the direct contact measure way,affecting the collecting of surface information of the roller blank by means of the lever mechanism.And the modularization design has been applied in the software system to accomplish online measurement,automatic datum recording,part distinguishing,parameters updating,statistic and analysis.The system can achieve 5 sectional diameters and straightness in one inspection,and its error is ±0.7 μm.Based on inspection of 50 blanks by random sample in many lots,the results obtained by the automatic inspection system are in good agreement with those by manual operations.The automatic inspection system can finish inspection of one blank within 20 seconds.