The disappointment and despondency of Korean citizens about the National Assembly have been heightened, especially disbelief about the quality and content of the legislation, which is the most significant assignment of the National Assembly. The case of regulation will not be special exceptions. In terms of regulatory reform, this study tries to analyze problems of the legislation of the Korean National Assembly and to present institutional and non-institutional alternatives, particularly focusing on the quality level of the regulation. To do this, this study identifies the theoretical principles of the legislation based on constitutional studies, and scrutinizes the specifics of the process and procedures of the Legislative Assembly of the Korean National Assembly, and discusses the problems associated with the Legislative Assembly raised in previous studies respectively. After that, a common response was addressed as a non-institutional and institutional solution. Consequently, the introduction of necessity and expected effect of the regulatory impact analysis regarding the legislative regulation prove the corresponding argument on the principle of the legislation. In addition, this study proposes the implications of institutional and non-institutional alternatives as a method to respond to the problems of the legislative regulation.