Notarization is the way agreed by the parties or according to law, and the contents of the contract are examined and notarized by the state notary office. The general notary office is based on the written form of the contract. After examining and confirming the authenticity and legality of the contract, it will affix a notary seal to the contract to prove it. A notarized contract has the most reliable evidential effect, and the parties cannot overturn it unless they have evidence to the contrary. China's laws adopt the principle of voluntariness in contract notarization.

Authentication is a way for the parties to examine the authenticity and legality of the contract content through the state contract management authority in accordance with the agreement or in accordance with the law. Certification is an administrative measure for the state to manage and supervise contracts, which can only be carried out by state administrative organs. The role of certification is to strengthen the probative force of contracts and improve the reliability of contracts. Taking evidence also adopts the principle of voluntariness.

Examination and approval refers to the examination and approval of a certain type of contract by the relevant competent departments of the state according to law. A contract that needs to be approved shall, in addition to the agreement of the parties, take effect after the contract and relevant documents are submitted to the relevant competent authorities of the state for examination and approval.

Registration means that the parties agree or submit the contract to the national registration authority for registration according to law. Registration is generally used for real estate sales contracts. Whether a contract is registered can be agreed by the parties themselves or stipulated by law.