Abstract: In order to improve the water dissolved oxygen monitoring methods, a WSN-based monitoring system of water dissolved oxygen is presented in this paper.Both the hardware and software of the acquisition and control system are studied in detail.Additionally, the implementation of network multi-hop transmission with the improvement of AODV Routing Protocol is introduced.The wireless gateway is illustrated as well as send text messages via GPRS.This design provides convenience for monitoring the water environment accurately in aquatic products breeding.