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In light of the shortcomings of ZigBee in the application of intelligent agricultural system, such as short transmission distance of single-hop, complex multi-hop network structure, easy signal interference, high error rate and packet losing rate, and poor practicability, a design scheme of intelligent agricultural system based on LoRa is presented; The plan realizes the system-aware layer design based on the LoRa network and a low power wide area Internet intelligent system is constructed based on a simple star network architecture; This paper sets forth design strategy from the aspects of the general layout of the system, network architecture, LoRa node and the soft-hardware design of LoRa base station, communication protocol and so on and the method to achieve agricultural production site environmental data acquisition and related equipment for remote control is also been explained in the paper, the experimentation testing and comparison with two aspects of the function and performance have been done;The experimental results show that the intelligent agriculture system based on LoRa has the advantages of simple networking, wide coverage, high reliability of data transmission, low power consumption and long working period, which is very suitable for popularization and application in complex agricultural production sites.