The research aims to propose improvement to legal theses deposit system in S. Korea by conducting comparative analysis of legal theses deposit systems in eight other countries including the US, the UK, Canada, Australia, France, Taiwan, Japan and S. Korea. The research used documentary research method including literature review by collecting and analyzing the legal regulations, ordinances, practical processes, and guidelines related to thesis submissions at national libraries and academic institutional depositories, as well as practical cases of thesis submissions at major universities in each country. Based on the analysis results, the key issues are identified and discussed, and corresponding suggestions for solving the issues are presented. For the improvement of the legal theses deposits systems, the research recommends legal amendments to the Library Law and Higher Education Law. On the practical side, the research proposes strengthening the legal foundation for KERIS, in collecting and providing theses, improving the operation of the dCollection system, and proposing a submission method focused on electronic theses.