This article applied program evaluation theory to assess the mechanism and possible blind spot of "Urban Renewal Act". This research finds that the incentive mechanism of "Urban Renewal Act" is effective, but the lack of outcome evaluation institution and empowerment of implementors leading to the problems of disequibilium of urban renewal areas and slowness of administrative operation procedural. And the amendment of "Urban Renewal Act" strengthened the protection of resident's right and social justice, but raises the difficulty of urban renewal. This article suggested a proactive "Urban Renewal Act" Amendment must include the introduction of new urban renewal paradigm, permits of multiple urban renewal implementors, conflict resolution mechanism and environmental protection issues. The aim of the article is to fill the gap between public administration study and urban renewal issue and to provide suggestions of "Urban Renewal Act" revise based on the evaluation.