According to the requirement of dam safety monitoring and combined with the characteristic of wireless sensor networks design scheme of a wireless sensor networks nodes for dam safety monitoring based on the JN5139 RF module is proposed.The typical network structure of wireless sensor networks is briefly introduced

the hardware and software design of wireless sensor networks nodes are especially described a cluster-tree type network is built in the field

and the sensor network is tested.The result of experiment shows that the node data acquisition is accurate and the signal transmission is reliable.