The Bill of Trade is considered as a new bill to improve Iran's domestic business law, which has many implications and interpretations and has taken a major step towards raising the level of those contracts while addressing business contracts. But the bill does contain some concepts that, despite their use among the bill's materials, have not been precisely defined. Goodwill is one of the issues that has created in the bill mentioned ambiguities about what goodwill is in the mind of the legislator and its relation to the general and specific meanings of goodwill in the history of Iranian business law. Therefore, in this article, we intend to address the ambiguities, while explaining and describing the goodwill in business promotion business contracts and their relation to the regulation of business contracts in the business environment, as well as its consideration in business law and business law. Adapt the concept discussed in the Commercial Law and the Commercial Contract Bill and examine the legislator's intention to apply goodwill in the above law. In summary, it can be said that goodwill is enshrined in the Business Contract Bill with its default meaning in the Commercial Law and Trade Law Doctrine, and in Business Contracts as a Business Promoter, the same general meaning is implied. It is considered. The research method used in the present paper is library-based and descriptive-analytical.