Government Procurement system adopting the lowest tender to handle public works causes getting bids at low-cost for companies and doing shoddy work and using inferior material, and it is considered to be the main reason for poor quality. After 921 earthquake,In order to safeguard the overall construction industry environment, the Construction Industry Act enhance the environment mechanisms of the construction industry. After the implementation of the Construction Industry Act, the law allows the combination of the relevant provisions of the Government Procurement Law, enhancing the quality of the tenderer. But the government procurement system has not been combined with related systems; leading to public works gotten bids at low-cost situation, it still can not effectively improve project quality.Since the 1990s, the new institutionalism research has returned to study the system and institution. The new institutionalism has not only fixed the view of the traditional institutionalism but also integrated views of economics and sociology. New institutionalism emphasizes on the system itself, the framework of norms, article and the actors to comply with the system. In addition, corrections and destructions which lead to institutional change are considered part of the system development. Only researching on the article and system itself can not show the flaws or evolution of the system itself and influence on actors to the system.This article combined with the construction industry system and the government procurement system, from system working viewpoint, we can see the current poor quality of public works procurement, it's because the bad situation in construction industry, the Government fails to effectively combine with the relevant laws, resulting in this situation does not improve. From the new institutionalism viewpoint under the existing mechanism, it's the reason why we can't enhance the quality of public works procurement.