Legal analysis: advance notice registration: refers to the agreement signed by the parties to buy and sell houses or other real estate rights. In order to ensure the realization of future property rights, they can apply to the registration agency for advance notice registration according to the agreement. For example, in the pre-sale of commercial housing, the buyer can pre-register the houses that have not yet been built to restrict the developers from selling or mortgaging the houses that have been sold again. Pre-mortgage registration system: at the same time when the buyer signs the house purchase contract with the developer and the buyer signs the loan contract with the bank, the pre-mortgage registration is generated on the filing system of the Housing Authority immediately, so as to exclude the third party from exercising the right to the property.

Legal basis: Article 34 of the Measures for the Administration of Urban Real Estate Mortgage, if the real estate is mortgaged according to law, the registration authority shall record his rights in the original real estate ownership certificate and the mortgagor shall take over. And issue the house ownership certificate to the mortgagee. Where a pre-sale commercial house or a project under construction is mortgaged, the registration institution shall record it in the mortgage contract. If the mortgaged real estate is completed during the mortgage period, after the mortgagor obtains the certificate of real estate ownership, the parties concerned shall re-register the real estate mortgage.