The design of real-time monitoring system of air quality is disccussed. The use of virtual instruments can reduce hardware designs. The real-time monitor, the display of curve and data are based on virtual instrument development platform LabVIEW. The use of wireless transceiver can get rid of space limitation and physical wiring, and curve fitting technology is used to achieve error correction and analysis, improve accuracy of the systematic sampling. This system has changed the trandi-tional methods, made the decetion system modular, intelligent, systematic and real time.