在反垄断法领域中,相关市场是个基本概念。相关市场的界定不仅是反垄断法主要制度的理论基础,也关系着反垄断法的具体适用,这使得相关市场的界定问题成为反垄断法实施的关键。笔者通过评述国外相关市场界定的发展,再从我国《反垄断法》第十二条为视角切入,探讨我国对相关市场界定的制度设计、现实困境及相关完善。 In the area of ​​antitrust law, the relevant market is a basic concept. The definition of the relevant market is not only the theoretical basis of the main system of antitrust law, but also the specific application of the antitrust law, which makes the definition of the relevant market the key to the implementation of the antitrust law. By reviewing the development of the relevant market defined in foreign countries, the author makes an analysis from the perspective of Article 12 of China’s “Anti-monopoly Law,” and probes into the system design, the realistic dilemma and the related perfection of China’s definition of the relevant market.