Abstract: In view of the shortcomings of ZigBee technology in water saving irrigation network, such as short transmission distance, complex network structure and easily disturbed during signal transmission, the design of water saving irrigation system based on LoRa is proposed in this paper. And based on the need of irrigation and the analysis of information transmission mode in LoRaWAN protocol, a hybrid transmission mode is presented to make a balance between power consumption and real-time performance.