There are many problems in the agricultural industrial chain such as bottlenecks,the disconnection between supply and demand,the uneven distribution of interests,and the difficulty of tracing the whole process of agricultural products.On the basis of organizing the development process and organization mode of China’s agricultural industrial chain,the paper uses the technical advantages of blockchain including the distributed storage structure,security and tamper-proofing,information openness and transparency,traceability and verifiability,smart contracts to build a dual-cycle pattern of agricultural industrial chain and conducts case analysis.The conclusions are as follows.Firstly,blockchain technology and agricultural industry chain are coupled in terms of attributes and structure.Secondly,based on the fair and efficient interest connection mechanism,smooth internal circulation of the industrial chain should be created through the multi-agent cooperation mode,and a stable cooperative relationship should be formed on the basis of common interests.Finally,with the verifiable and traceable trust sharing mechanism as the core,a whole process traceability system of agricultural products should be established,which includes the internal alliance chain and external alliance chain of agricultural product traceability,so as to realize the mutual promotion of internal and external circulation of the industrial chain.