International trade law is a set of rules and regulations that govern international trade relations and refers to the rules, principles, laws and regulations that control and regulate trade relations across borders. These relationships may have the characteristics of private rights or have a public aspect. The extent of the legal issue in business includes the conclusion of the contract to various regulations. Since the most important goal of international trade law is to regulate and harmonize commercial relations at the transnational level so that merchants and business companies can prosper by anticipating commercial risks and taking into account the rules governing their activities. and help international work. This research intends to use a comparative approach and a descriptive and analytical research method using written and documentary sources, and after describing and explaining each of the topics, it has been tried to compare between the systems governing international trade. The Roman-Germanic system and the common law system. As a result, the two legal systems have important and practical differences in the rules governing the formation of international commercial contracts, in addition to having common features. These differences are in the foundations and resources in the field of contract formation, different style of judicial decisions, doctrinal analyzes and differences in the interpretation of contracts, breach of contract and compensation, etc.