Trems-3000l consists of four basic parts: flue gas pollutant monitoring subsystem (SO2, NOX), particulate matter monitoring subsystem (particulate matter), flue gas parameter monitoring subsystem (temperature, pressure, flow rate, humidity, O2), system control and data acquisition and processing subsystem。The system consists of a sampling probe, a dust concentration measuring instrument and a temperature and pressure flow monitoring instrument placed on the chimney, and an analysis cabinet, standard gas and instrument air placed in the cabin。