As long as the deepen application of the Intelligent equipment technology in the Water Saving Irrigation, a hot topics in research is coming out, that is how to increase the proportion of the efficiency and output for the high tech facility in manufacture. The Modbus protocol based on u C/TCPIP will play an important role in the Water Saving Irrigation application system, comparing to the others, it has such advantages of the Reliability of communication technology and real-time performance. After analyzing components of Modbus/TCP protocol, we applied it on real-time u C/OS-II kernel and ARM7 software and hardware and hardware environment with Modbus frame embedded in TCP frame. Test results show that Modbus/TCP protocol can achieve industrial standards. The protocol realizes the interconnection of control network and information network and has a broad application prospect in the agricultural water saving irrigation.