YX-CEMS is a flue gas monitoring system of the new generation. With the cutting-edge technologies in the world, the laser transmission method is used for measuring the concentration of the flue dust, warm pipe for random sampling, and non- dispersive IR spectrum absorption method for measuring the concentration of pollutants in flue gas, including SO₂, NO_x, CO and CO₂. The pitot, pressure sensor, temperature sensors and oxygen-content analyzer are used for measuring the parameters of flue gas, and the IPC, PLC and software developed by Universtar are used for acquiring and processing data, real-time monitoring, generating graphics and reports and controlling the system. This System is characterized by its high exactness, high degree of reliability and high cost-performance ratio. Granted with the certificate of Approved Environmental Protection Product issued by State Environmental Protection Administration,, the System is listed as a key promotion item of the state technological findings and into the contents of State Torch Program.