According to the General Principles of the Civil Law, what is the basis for the guardian to dispose of the ward's property?

The foundation is for the benefit of the ward.

General Principles of Civil Law of People's Republic of China (PRC);

Article 18 A guardian shall perform his guardianship duties, protect the person, property and other lawful rights and interests of the ward, and shall not dispose of the ward's property except for the benefit of the ward.

The right of guardians to perform their guardianship duties according to law is protected by law.

If the guardian fails to perform his guardianship duties or infringes upon the lawful rights and interests of the ward, he shall bear the responsibility; If property losses are caused to the ward, compensation shall be made for the losses. The people's court may, upon the application of the relevant person or unit, revoke the qualification of guardian.

Extended information "General Principles of Civil Law of People's Republic of China (PRC)":

Article 17 A mental patient without or with limited capacity for civil conduct is the guardian of the following persons:

1, spouse;

2. Parents;

3. Adult children;

4. Other close relatives;

5. Other close relatives and friends who are willing to assume the responsibility of guardianship shall be approved by the residents' committee or villagers' committee of the unit where the mental patient works or the place of residence.

If there is any dispute about being a guardian, it shall be designated by the residents' committee or villagers' committee of the unit where the mental patient belongs or the place where his near relatives live. If a lawsuit is filed against the designation, it shall be ruled by the people's court.

If there is no guardian as stipulated in the first paragraph, the unit to which the mentally ill person belongs or the residents' committee, villagers' committee or civil affairs department of his domicile shall act as the guardian.

Baidu Encyclopedia-General Principles of Civil Law in China