预告登记的性质分为形式意义的性质与实质意义的性质。前者是指预告登记制度本身的性质,没有特别探讨的必要,后者指经预告登记的债权请求权的性质,其决定着预告登记的效力。本文重点讨论了预告登记所保全的请求权的性质。 The nature of the notice of registration is divided into the nature of the formal meaning and the nature of the substance. The former refers to the nature of the nature of the advance notice registration system, there is no special discussion is necessary, the latter refers to the nature of the right to claim the registration of advance notice, which determines the validity of the notice of registration. This article focuses on the nature of claims held by advance notice registration.