Legal analysis: 1. Advance notice registration refers to the agreement signed by the parties who buy or sell houses or other real estate rights. In order to ensure the realization of property rights in the future, you can apply to the registration authority for advance notice registration as agreed. 2. As a temporary registration, the mortgage advance notice registration is neither the supervision of the administrative department on auction transactions nor the mortgage registration with direct dominance. Its purpose is to establish auction transactions. Due to various reasons such as housing construction, there is often a long interval between the establishment of creditor's rights and the transfer registration of real estate. In order to balance the interests of all parties in real estate transactions and maintain the security of transactions, the law gives the mortgage notice registration the real right effect against the third party. But because the real right of real estate has not been established, it is not. 3. Mortgage advance notice registration is a temporary registration behavior to ensure the smooth progress of future property right changes when the house does not have the legal property right form and cannot be registered according to law. Only when the conditions are met and the mortgage registration is completed can the mortgage effect of priority compensation be produced. Legal basis: Article 221 of the Civil Law of People's Republic of China (PRC), when a party signs an agreement on the sale of house or other real estate rights, it may apply to the registration authority for advance notice registration in order to ensure the realization of future real rights. After the advance notice registration, if the obligee without advance notice registration agrees to dispose of the real estate, the real right effect will not occur. After the advance notice registration, the creditor's rights are extinguished, or if the application for registration is not made within 90 days from the date when the real estate registration can be carried out, the advance notice registration is invalid. Derivative problem: advance mortgage registration process: 1. Application 2. Acceptance 3. Fee 4. Audit 5. Register. 6. Repair certificate 7. Issuance of certificates.