1, the will can reflect the true meaning of the testator;

2. The content and form of the will do not violate the law;

3. The testator is a person with full capacity for civil conduct;

4. Other conditions.

Article 143 of the Civil Code of People's Republic of China (PRC)

A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.

Article 135

A will that entrusts others to write on behalf of others shall be witnessed by two or more witnesses, and one of them shall write on behalf of others, which shall be signed by the testator, agent and other witnesses, and marked with the year, month and day.

Article 143

A will made by a person without or with limited capacity for civil conduct is invalid.

A will must express the true meaning of the testator, and a will made by fraud or coercion is invalid.

Forged wills are invalid.

If the will is tampered with, the tampered contents are invalid.