Abstract: To improve the stability of cut tobacco blending system,the index of the system's cumulative measuring accuracy deviation range were quantitatively determined by establishing a measuring model and analysis based on it,and combining with application of a single value-moving limit error control chart,the process for calibrating the measuring device in the system was optimized.Application results showed that the cumulative measuring accuracy δ of the system was less than 0.65%,any system abnormals could be identified intuitively,the measuring device be calibrated timely.The measuring accuracy was kept within the controlled range,and the consistence of intrinsic quality of cigarette was guaranteed.