Abstract: For chronological, continuous and systemic administration for legionella monitoring data in public places, and providing the concise and friendly inquiring interface, legionella monitoring and inquiring system in public places has been desiglae This system can promptly upload the monitoring data and administrate, analyze and share the data, which can improve the work efficiency. This system is the foundation of building the subsequent precaution system. The design ideas and methods for this system can also be the reference for other monitoring and inquiring systems in public health field.