The street bureaucracy theory has been widely used and studied both inside and outside China， but it appeared in 1969 instead of in 1977. The research of street bureaucracy theory mainly follows three main lines abroad and presents two stages in China. The window period has been extended from the medical field to the research of public policy. For the window governance, we can establish a window government function theory to evaluate the window governance ability quantitatively, which is helpful to realize the modernization of window governance. Civil servants, working at service windows during the window period of policy or reform, are more likely to breed fallacious governance. To overcome these fallacies, efforts should be made to optimize the working environment, improve the incentive system and strengthen the power restriction mechanism. At the same time， efforts should be made to improve relevant laws， strengthen the responsibility control and improve the administrative quality of civil servants discretion during the regulation window period.