Abstract:  To realize supervising and adjusting the concentration of carbon monoxide of underground garage，Concentration detection of carbon monoxide in the underground garage，alarm and ventilation control are studied． An underground garage ventilation control system based on TMS320F2812 is designed． It consisted of four parts: centralized controller，data collection and actuators，communication module and site control device．Micro -controller is used to control the work site． It was used to adjust all induced draft fan unified centralized control mode and parameters． Data acquisition and actuators included CO ( Carbon Monoxide) concentration sensor and microprocessor． It was responsible for receiving the host computer's various operations control commands and parameter settings to achieve the concentration of CO detection and dynamic display． Site control device consisted of relays，induction fan，alarm and 12864 display components． The experimental results show that a good energy-saving effect can be achieved by intelligently controlling the inducing jet
exhaust． This article provides a theoretical basis for the development of ventilation automation in underground garages．

Key words: detection control;ventilation induced, garage ventilation control system, Carbon Monoxide ( CO ) concentration