Internalization theory shows that in an incomplete market, companies can establish an internal market and own or control intermediate products to reduce transaction costs and obtain internalization benefits. The business ecosystem (ecological chain) is an economic alliance formed by the interaction of organizations and individuals. The ecological chain can be regarded as the application of internalization theory at the strategic level of the company. Through reasonable ecological chain expansion, each department in the ecosystem can achieve synergistic benefits, and enterprises can obtain greater profits. Both LeTV and Sony have already expanded the ecological chain. LeTV has established seven major ecosystems, but ultimately failed. Sony has successfully risen by expanding the ecological chain. The difference between the two lies in three points: first, whether they have mastered monopoly technology; second, whether they can integrate different audiences; third, the allocation of financial resources in the internal market.