Abstract: The study was based on internet of things technology research, extension and application in facilities vegetables that was joint applied project with agricultural enterprise in food safety field from World Bank, to carry out the demand-oriented trinity promotion model research. The study followed the functional research group constructed and its management system, the establishment of communication mechanism for demand oriented technology development; the soft and hard conditions for the innovation internet of things technology achievements were adopted. Then it formulated the active role of demand-oriented trinity promotion model as below: (1) Contribute to integration of technology innovation and technology applications system to shorten the chain of information dissemination, and improve the efficiency and effectiveness of the research. (2) Favorable to build demand oriented specialized agricultural extension from the whole industry chain. (3) Help to change the value orientation of the researchers from academic research oriented move to practical transformation. (4) Help to promote the welfare of service mode move to diversification mode to improve the efficiency and effectiveness of agricultural extension system. It is expected that the results of this study can provide a valuable reference for the transformation of the agricultural extension system in the stage of modern agriculture development.