Contract is the agreement between the parties or parties to establish, change, terminate civil relations. Contracts established in accordance with the law , protected by law. Broad contract refers to all legal sectors of the agreement to determine the relationship between rights and obligations. Narrow contract refers to all civil contracts. There is also the narrowest contract only refers to civil contracts in the debt contract. Article 85 of the General Principles of Civil Law of the People's Republic of China: A contract is an agreement between the parties to establish, change or terminate a civil relationship. Contracts established in accordance with law are protected by law. Article 2 of the Contract Law of the People's Republic of China: A contract is an agreement to establish, change or terminate the relationship of civil rights and obligations between natural persons, legal persons and other organizations of equal subject matter. Marriage, adoption, guardianship and other agreements related to identity relations, the provisions of other laws shall apply.