Abstract: According to the need of environmental control and environmental data monitoring of greenhouse facility agriculture, an intelligent monitoring system taking LJD-51-XA+ Single chip microcomputer as the control core was designed. The system integrated with sensor technology, automatic detection technology and communication technology, achieved the goals of data collection, storage, display, monitor and control to temperature, humidity, light intensity and CO₂ concentration in greenhouse. The intelligent monitoring system runs stably, the measurement results are accurate and reliable, and the expansibility is strong, which can meet the requirements of monitoring and control.