Promoting the “Three Chains Isomorphism” of the grain industry is conducive to giving full play to the advantages of grain production，playing the trump card of grain，optimizing the grain industry system and realizing the high-quality development of the grain industry. It is the way to comprehensively solve the economic development problems of the grain industry，and it is also an important part of the implementation of the “Six Guarantees” task. It has important strategic significance for promoting the rural industry revitalization and the structural reform of the agricultural supply side，and realizing the unity of food security and modern and efficient agriculture. It is necessary to conform to the trend of industrial development，on the basis of doing a good job in the self-construction of the three chains，identify the infiltration and integration points of high-tech and the complementary extension points of industrial functions，deepen the interactive coupling and deep integration of the three chains，promote the reorganization of resource elements among the three chains，reconstruct the industrial chain，and expand the development space，forming an industrial ecology with high industrial development quality，good efficiency，scientific spatial layout，reasonable interest connection，and strong sustainability and competitiveness.