The house purchase fund refers to the funds jointly raised by the house selling unit and the house purchaser for the maintenance and conservation of the public parts and facilities of residential buildings. The principal of the purchase price shall be paid jointly by the selling unit and the purchaser, and the ownership shall belong to the payer. The interest of the house purchase fund is usually used to pay for the maintenance and conservation of public parts and facilities of residential buildings. If the interest is not enough to pay the maintenance cost, the owner will distribute it according to the agreement or relevant regulations. The establishment of the house purchase fund aims to ensure that the public parts and facilities of residential buildings are repaired and maintained in time, and improve the overall housing quality and living environment.