Abstract: An integrated control system was designed for carbon monoxide gas detection, emission and recycling based on tunable diode laser absorption spectroscopy. A MCU MC9S12DG128B was embedded in the system as its core controller to produce laser modulation signal. By collecting optical power and the second harmonic of the absorbed gas, the gas composition and concentration was analyzed, and then the information of the gas concentration was uploaded to a real-time industrial computer. The results show that the laser detection of gases with high sensitivity and selectivity, fast response, continuous analysis and anti-jamming performance, and it meets the requirements in the industrial field.