This paper focuses on the normative issues and improvement plans related to maritime traffic safety of Maritime Autonomous Surface Ships (hereinafter referred to as“MASS”) related to human elements, including prior research on the normative study autonomous vessel. This work tried to find out what the regulatory barriers for securing maritime traffic safety in earnest when an autonomous vessel with the automated system. And it proposed the improvement plans to review any restriction conditions and problems of The United Nations Convention on the Law of the Sea(UNCLOS) and the International Maritime Convention. The purpose of this research is to suggest an improvement plan for the safety of maritime traffic through legal issues related to MASS that will change the paradigm of the future maritime industry including Shipping and Port and comparative legal consideration. This paper analyzed the characteristics and definitions of MASS and the autonomy in order to secure the safety of maritime traffic. The Autonomous airplane and Self-driving car field which have advanced in autonomy have been examined comparatively. In MASS, It has been concluded that this research faithfully fulfill both reliability of the technology and normative maintenance. Also, it is desirable to make a system that does not replace humans but that requires human intervention and keeps safety in common. In addition, the International Convention and the matters related to the safety of maritime traffic on autonomous vessel were compared with each other in domestic and foreign laws and regulations. This research have sought to explore whether there are any problems in applying the existing laws and regulations for MASS which completely different from the existing ship operation forms. As a result, This paper have determined that MASS can enjoy their status as vessels regardless of the human factors that played an essential role in conventional vessels. It was proved that very difficult for MASS to operate and secure safety within the framework of the UNCLOS and the International Maritime Convention. Therefore, if the technical reliability of MASS is seriously suspected, or if they are not expressly contrary to international conventions or flag laws, it is the general principle of the international community to treat vessels under the principle of international reciprocity or international comity. This paper examined the MASS in terms of human, ethical, and physical as to whether there are any regulatory barriers that violate the UNCLOS, the International Convention, and flag laws & regulations. The issues of human regulatory barriers for securing maritime traffic safety were examined by focusing on COLREG, STCW, LLMC, SOLAS(chapter VI, V, Ⅸ, XI). In relation to the MASS ethical dilemma, this research looked at what to consider and decide on navigation algorithm programming. MASS are based on sophisticated computer system, so ethical problems applied to Artificial Intelligence(AI) are very important. Ethical considerations also need to be studied in the future. Consequently, even if it is the MASS lacking human factors, it is an essential element that can not be abandoned and it is a great advantage in terms of securing the safety of maritime traffic. Therefore, it is appropriate to review the matters and related regulations by absorbing and integrating them in the existing normative system rather than the special law system that recognizes the specificity or exceptionality of MASS. In this regard, this research introduced the legislative proposals for the introduction and operation of MASS regarding the safety of life and maritime traffic and the prevention of marine environmental pollution at sea. Finally, Amendments for the domestic maritime law proposed relating to the definition of MASS, the permission of the provisional operation of MASS, the safety operation requirements, the collection of sailing information and suspension & punishment for MASS, Master's authority and duty for onboard reflecting the specificity of the sea.