Legal analysis: the housing maintenance fund is used for life and only needs to be paid once before handling the handover procedures. If the housing maintenance fund is used during the owner's residence, resulting in less than 30% of the book amount, it needs to be renewed.

Legal basis: Article 17 of the Measures for the Administration of Residential Special Maintenance Funds. If the balance of residential special maintenance funds in the owner's account is less than 30% of the first deposit amount, it shall be renewed in time.