1, if the mentally retarded person is a person with no capacity, his legal guardian can dispose of his property, including his share of the estate. 2. The legal guardian shall not damage the property interests of a person without capacity for conduct, and shall make compensation if losses are caused. 3. Relevant provisions of the General Principles of the Civil Law: Article 18 A guardian shall perform guardianship duties, protect the person, property and other lawful rights and interests of the ward, and shall not dispose of the property of the ward except for the benefit of the ward. 4. The guardian's right to perform 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.