This paper uses the theory of Institutional change as research tool to analyze from the angel of informal rules formal rules and enforcement system which is fresh . The conclusion from the thesis is pointed .

本文运用 诺斯的制度变迁理论作为全文的分析 工具，从非正式规则、正式规则、实施机制三个层面展开全文，具有新颖性，而且分析工具 贯穿全文，得出的结论具有针对性。