Paragraph 2 of Article 17 of the Law of Inheritance stipulates: "A self-written will is written by the testator, signed and marked with the year, month and day." Therefore, the will must be written and signed by the testator; The year, month and day must be marked. You don't need a witness to write your own will. However, the printed will is only a signature, indicating the year, month and day, and its validity is controversial, depending on the specific situation. If there is evidence to the contrary that the printed will is not what I really mean, it is likely to be considered invalid. So it's best to write your own will, with personal handwriting as evidence. In addition, there are the following requirements for the validity of the will: 1. A testator must have full capacity for civil conduct. That is, a will made by a person who has reached the age of 18 and is in a normal mental state is valid. 2. The will must be the true meaning of the testator. Wills made by coercion or fraud, as well as altered or forged wills, are invalid. 3. The contents of the will shall not violate the law, and shall not harm the interests of the state and the collective. 4. The will should reserve the necessary share of the inheritance for the heirs who lack the ability to work and have no source of income.