(1)当事人具有相应的订立合同的能力。

(1) The parties have the corresponding ability to conclude the contract.

(2)意思表示真实。意识表示真实是合同有效的重要条件，在意思表示不真实的情况下不能仅以行为人表示于外部的意思为根据，而不考虑行为人的内心意思。

(2) The meaning is true. The truthfulness of the expression of consciousness is an important condition for the validity of the contract. In the case of untrue expression of intention, it is not only based on the actor's external intention, but not the actor's internal intention.

(3)不违反法律和社会公共利益。合法是民事法律行为的本质属性，也是民事法律行为有效的当然要件。

(3) It does not violate the law and social public interests. Legitimacy is the essential attribute of civil legal act, and is also the necessary element of the validity of civil legal act.

(4)具备法律、行政法规规定的合同生效必须具备的形式要件。所谓形式要件，是指法律、行政法规对合同形式上的要求，形式要件通常不是合同生效的要件，但如果法律、行政法规规定将其作为合同生效的条件时，便成为合同生效的要件之一，不具备这些形式要件，合同不能生效。当然法律另有规定的除外。

(4) It has the formal requirements required by laws and administrative regulations for the contract to take effect. The so-called formal requirements refer to the requirements of laws and administrative regulations on the form of a contract. The formal requirements are usually not the requirements for the contract to take effect. However, if the laws and administrative regulations stipulate that it is a condition for the contract to take effect, it will become one of the requirements for the contract to take effect. Without these formal requirements, the contract cannot take effect. Unless otherwise stipulated by law.

合同能产生法律效力就在于当事人的意思表示符合法律的规定，不合法的合同显然不能受到法律保护，也不能产生当事人所期待的法律效果。

The legal effect of a contract lies in the fact that the expression of the parties' will conforms to the provisions of the law. It is clear that an illegal contract cannot be protected by law, nor can it produce the legal effect expected by the parties.

同时，在内容上也不得违反社会公共利益。

At the same time, the content shall not violate the social and public interests.