The harmonious generation relationship is the foundation of the system,which economic supporting,life service and spirit comfort depends on everyone of the family.

Taking Intergenerational relationship in Chinese urban families as the object of study, the dissertation studies the changing trend of the traditional feedback model in the Chinese society, so as to reflect the characteristic modernization of Chinese families.

Therefore different intergenerational relations are shaped.

But either from its biological sense (intergenerational extension) or from its economic sense (the intergenerational allocation of resources) or cultural sense (the intergenerational commitment or identification of values), the intergenerational relation in traditional society doesn't exist as "questions", but are concealed by economic relation, political relation, social relation .

Generation ethics refers to an ethical form of human relationship between generations, which is mainly embodied in the following aspects such as generation gaps in moral values and the communication between generations, family generation ethics, lasting development and equality between generations, and generation ethical problems caused by modern science and technology.

On Effect of Private International Law in Contemporary International Relations;

International private international law as an important international legal system has been playing an important role in contemporary international relations.

Position of sustainable development is a fresh perspective to study contemporary international relations.