1, principle of equality. The legal status of both parties to the contract is equal, that is to say, there is no relationship between obedience and obedience. Even if the parties have unequal relations in other aspects (such as administrative relations), they must be in an equal position when concluding a contract;
2. The principle of voluntariness. The parties to a contract have the freedom to conclude and not conclude a contract, the freedom to choose the parties to the contract, the form and content of the contract, and the freedom to modify and terminate the contract. No natural person, legal person, other organization or even state organ with public power may illegally interfere.
3. The principle of fairness. In the process of contract conclusion, performance and interpretation, the rights and obligations between the parties to the contract should be adjusted with the concept of fairness;
4. The principle of good faith. In real estate activities, the parties should be honest and trustworthy to ensure that all parties can obtain their own interests, and at the same time, they should not harm the interests of third parties and society through their own actions;
5. The principle of legality. The contents of the contract should be legal.
Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC).
If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.
A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.