A succession is a person who takes the place of another person and does his work. The succession sometimes acts for the implementation of other personal goals and sometimes for the implementation of his own goals. In general, the succession is divided into two types, the first type is the general succession, such as the heirs of the deceased, and the second type is the special succession, such as the person who becomes the owner of another person's car by concluding a contract, and the car is transferred to him, which in the term It is called transferee. A succession is a person who, without an intermediary or through a representative, did not play a role in the conclusion of the contract and in the structure or formation of the contract, but as a result of the transfer of the rights and obligations of one of the parties to him, he becomes the substitute of the main party and benefits from the rights and benefits of the contract. And in return he will stick to his commitments. Sometimes, some legal writers use the two words representative and succession instead of each other, but these two words are independent of each other in such a way that in the representation, the representative acts on behalf of the principal and as a result, profit and The loss of his action will be towards the principal, while the succession becomes the  owner of the right and exercises his right on his behalf. In this article, we aimed to investigate the types of succession with a descriptive-analytical method and answer these questions: What are the examples and foundations of succession in Iranian law? What are the types of general and special succession and the scope of their performance in Iranian law.