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Optical intensity monitoring in industry, agriculture and daily life play an increasingly important role in people's lives. Optical intensity monitoring system for the current existence with circuit complexity and low accuracy problem, a real-time monitoring system for optical intensity based on wireless sensor network was designed. Using TAOS company produced a high-performance optical intensity sensor TSL2561 to Collect data, and then wirelessly transmit collected information to sink node. The system can set the maximum and minimum value of optical intensity, when the optical intensity exceeds the limits after the system alarm. Experiments show that: the system is responsive, stable and reliable, can be used in greenhouses, street optical control and so on.