With overview of the diversification theory, we could know the resource-based view theory played a very important role among enterprises¡¦ diversification process. According to our observation, 7-11¡¦s outstanding performance created by itself and its subsidiaries proved that 7-11 did very well on its accumulation and exertion of its resources during its expansion. However, the accumulated resources and exerted resources achieved tremendous performance for 7-11. Moreover, 7-11 had been promoted to be the leader of retail industry successfully. That was why 7-11 was a good case study for understanding the application of the resource-based view theory. Apparently, the theory of resource-based view theory exploited by 7-11 to realize diversification was worth to learn. Therefore, our works employed the resource-based view theory to explore how 7-11 developed their resources and capabilities among its diversification by organizing second-hand data, and obtained the further information by interviewing managers of Cosmed, Starbucks, MUJI, and Dream-mall. Interviews also brought other discoveries; we found out that a shared service creating profound synergies was also the successful application of horizontal strategy, so this theory became another significant issue in our works. Consequently, in the last chapter, we summarize 7-11¡¦s diversification by using three mechanisms, which are reinforcement, supplement, and sharing.