At present, the competition between enterprises and enterprises has been gradually transformed into competition between supply chain and supply chain, supply chain management has gradually become the important strategy of enterprises to obtain competitive advantage while promoting the integration between the supply chain members is the key to the success of supply chain management. Based on researches about supply chain integration, the article discusses the evolution of supply chain integration from two dimensions:strength and span. Then, the article points out that the behavior of supply chain members depends on relationship learning in the process of supply chain integration. This article provides a new angle to understand the supply chain integration. What's more, the article uses the case of Yonghui to supplement the theory.