Theoretical framework of international e-commerce provide important guidance and theoretical basis for enterprises to expand their business in the global market. In the context of globalization, e-commerce has become one of the most important ways for enterprises to expand their business in the international market. However, the development process of international e-commerce involves numerous factors and challenges, so understanding and applying appropriate development models and theoretical frameworks are crucial for formulating effective internationalization strategies. In this part, we will introduce two important development models: the Uppsala model and the diamond model, and three important theoretical frameworks: the resource-based theory, the transaction cost theory, and Porter’s value chain theory.