This chapter first introduces the overview of e-commerce contracts, including the concept and characteristics of contracts, the concept and characteristics of electronic contracts, and the concept of e-commerce contracts; secondly, the concept and characteristics of electronic commerce contract formation, electronic commerce offer, electronic commerce commitment, and the time and place of electronic commerce establishment were introduced; finally, the effectiveness of e-commerce contracts is introduced, including the concept of e-commerce contract effectiveness, principles of electronic error and presumption, as well as the concept, characteristics, limitations, invalidity of exemption clauses, and interpretation rules of e-commerce format contracts.