We analyze and study class modifiers with program code in view of access-control, inheritance-control and compiler-control.

In the object-oriented finite element program, utilizing the inheritance and polymorphism may establish the object family that has the same key features, and can achieve the reuse of the code.

This paper discusses the inheriting mechanism in Object - Oriented language,presents the selecting inheriting mechanism to weak points implementing inheritance.

The inherit system of Chanyu kingship of Hun changed edidently after Chanyu Huhanye.

On this basis, this paper analyzes the defects in the present inheritance system of rural land contracted management rights, and puts forward some suggestions for the problems of improving the inheritance system of rural land contracted management rights.

And the detailed explanation is given to the process of status inheritance and family property assignment in the Peaceful and Honored Mansions,thus forming a miniature of Qing Dynasty inheritance system.

The establishment and development of inheritance system is closely related to the historical and social background deserved to explore.

Effect of Primogeniture on Medieval Town Forming;

The causes that the primogeniture was carried out in property by the nobles in the medieval Western Europe was not only in the interest of the Over Lord.