This study examines the development of major theories related to legal reservationin Germany from a constitutional perspective and presents implications and challenges toKorean public law from the basic perspective seen in the discussion of German public law onlegal reservation. In order to achieve the above research objectives, a literature researchmethod is attempted to review the books, papers, and precedents of Korea, Japan, and Germany on this topic. In the early days, the realm of legal reservation was limited to limitedbasic rights such as individual freedom and property rights, and its main significance was tosecure the legislative realm of the representative body, the parliament, from the executivepower of the administration. However, since then, the center of the discussion on legalreservation in Germany has emphasized the substantive discipline of administrative activitiesby law, trying to control administrative power under the detailed discipline density necessaryto achieve the purpose of protecting the rights and interests of the people. And today, legalreservation is not just a control principle of administrative power, but also a constitutionalprinciple. As such a constitutional principle, the basic perspective seen in the discussion ofGerman public law on legal reservation has great implications for us, in particular, as aconstitutional principle, efforts to promote an organic interpretation of related provisions in theconstitution based on legal reservation are one of the important tasks of Korean public law inthe future.