At present, the application of blockchain is still at the level of private chain, lacking of systematicness and comprehensiveness, neglecting the participation process of multi-agent stakeholders, and the overall application system is not clear. This paper aims at applying the blockchain technology to the field of e-agriculture, building the hierarchical theoretical framework of e-agriculture, and revealing the impact of blockchain on e-agriculture. Through dividing the hierarchy, this paper finally structures an innovative service UIS application system for e-agriculture using blockchain technology. The main conclusions are as follows: (1) the first step is to solve social problems; (2) economic tasks are influenced by social problems and focus on smart contracts; (3) sustainable improvement of environmental problems requires a balance between economic and social dimensions; (4) application system is constructed at the three levels of unity, information, and supply chain.