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Heavy rainfall and aging urban drainage system make the low-lying road waterlogged seriously and have an important effect on the safety and property of citizens, roadbed and urban traffic. In order to solve this problem, the wireless sensor / actuator network (WSAN) technology is used to design a monitoring system. The system is divided into three layers:sensor / actuator layer, network layer and application layer. Ultrasonic sensors are deployed to collect the information of water level in sensor nodes of sensor / actuator layer, actuator pump is used to drain away the water in actuator nodes of sensor / actuator layer. The ZigBee network and GPRS network are configured for two-way data transmission between sensor / actuator layer and application layer in the gateway and sink node of network layer. The server of application layer stores the information of road waterlogging, calls Baidu map API to display the real-time information on the web, and sends commands to achieve closed-control by controlling the actuator pump in the road waterlogging area action through the network layer. The system not only shares the real-time information of the road waterlogging simply and effectively, but also realizes the timely drainage. So it has practical application value.