In order to monitor the reliability of the CEMS operation data of a thermal power plant in Hangzhou, the data of its operation process were collected. The components of uncertainty influencing on the particles concentration measurement, including zero drift, range drift, relative accuracy and measuring repeatability, were analyzed in the system. The confidence interval (2.80%) and the allowable interval (8.94%) were introduced to ensure the reliability of the system data. The result of evalution shows that the related expanded uncertainty of particles concentration measurement is 9.26% when coverage factor is k=2 and level of confidence is 95%. Measuring repeatability is the main factor affecting the uncertainty.
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