The study of the evolution of international norms is of vital importance for the understanding of the origin of orders in the anarchical international society.

When they are of quite enormous authoritativeness, international norms will form norm groups, which pose direct impact upon states\' behavioral room and effects.

Processual constructivism is an evolution theory at systemic level, focusing on interactive practices among states and emphasizing the independent ontology of social processes which play a meaningful role in constructing international norms and state identities.

An Economic Analysis on Change and Implemental Mechanism of International Rules;

The paper proposes a number of countermeasures and assumptions for speeding up the establishment of a Sino-foreign cooperation mechanism in this field in accordance with the international rules.

Comparative analysis of four primary international rules of governmental engineering procurement, those are the WTO GPA, the uncitral model law, the EU directives on public procurement and the WB procurement guidelines, primarily study on the principles and objectives, application scopes, procurement modes, procurement procedures challenge procedures and so.