Maintenance fund, also known as "public maintenance fund" and "special maintenance fund", refers to a fund that residential property owners pay a certain amount to a special account for the maintenance of public facilities and equipment in the property area, and authorize the owners' committee to manage and use it uniformly. The maintenance fund is raised by the owners of the property, who enjoy the ownership of the maintenance fund according to the proportion of payment, but the right to use it belongs to all owners, and individual owners may not withdraw all their own maintenance funds from the bank. The maintenance fund is combined with a specific house, exists with the existence of the house, and is also lost with the existence of the house, and does not change because of the change of the specific owner. When the house property right is changed to a new owner, the maintenance fund should also be renamed from the old owner to the new owner.

The housing maintenance fund is used for large and medium-sized repair and renovation projects of the main structure, public parts and public facilities and equipment of the house after the warranty period expires. The main load-bearing structures of houses include foundation, internal and external load-bearing walls, columns, beams, floors and roofs. Public parts refer to outdoor walls, hallways, stairwells, corridors, etc. Public facilities and equipment refer to water supply and drainage pipelines and equipment, distribution cables and equipment, elevators, public lighting, fire-fighting facilities, green spaces, roads, ditches, non-operating parking garages, public cultural and sports facilities and other facilities and equipment owned and used by the owner.