Tunable Semiconductor Laser Absorption Spectrum (TDLAS) technology, by placing a network format laser channel in one or more sections of the furnace, at the same time measuring O2, CO, H2O and other gas concentrations and burning temperature parameters, and real time generating a furnace burning condition stereo analysis chart, solving the boiler furnace parameter measurement technology problems, achieving a burning process accurate measurement, providing a foundation for boiler burning optimization and economic operation. A cɔl boiler CT.