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Aiming at the problems of the underground car park of a single automated monitoring and management, the lack of intelligent parking guidance and the poor management of park lighting、ventilation and pumping station, the paper put forwards a intelligent monitoring and car guidance system of the underground car park based on KNX bus. By making each node device mounted on the KNX bus to build KNX system. The intelligent terminal hanging on the KNX bus realized the monitoring and management of the whole underground car park, this is to realize the monitoring and management of the park lighting, ventilation equipment, intelligent car detection, parking space detection and the parking guidance function. Practice proves that the system operation is stable and reliable, good real-time performance and strong anti-interference ability.