1) Usucaption regime is an ancient law system.

2) But if registered, it cannot apply to registered usucaption.

3) Usucaption is an old system in the traditional civil law. In Roman Law it was formulated as one kind of prescription system, and was passed on in civil code of different counties.

4) The usucaption, together with the bona fide acquiring, extinctive prescription, registration of real property and possession, forms the system of the protection of right on property.

5) It is the the economic source of usucaption that uncultivated lands is existing in our country.

6) So the usucaption has the function of protect the economy order.

7) This article analyses the constitution requisites and applicable targets of usucaption, then the relationship between usucaption and other civil law system.