In Korea, the Minister of MOF (Ministry of Oceans and Fisheries) established and managed certain areas which have heavy maritime traffic and many concerns about critical marine accident as a ‘Traffic Safety Designated Area’. Especially, Pohang Traffic Safety Designated Area has the widest area among five Traffic Safety Designated Areas. In terms of vessel traffic safety, it would be helpful if traffic safety designated areas were established in as many and as large a range, but a designation of the area brings many administrative actions and limitation of commercial activities. Therefore, the establishment of a traffic safety designated area will need to be reviewed not only for traffic safety but also foe economic and efficient operation. In this study, traffic flows of particular vessels (large ship, dangerous cargo carriers and high-speed passenger vessel) in the Pohang area are analyzed comparing with Pyeongtaek, Mokpo, Jinhae Bay and Daesan area which has relatively high traffic volume. As a result of study, it is difficult to say that Pohang Area has more active traffic flows of particular vessels (Large ship, Dangerous cargo carrier, High-speed passenger vessel) even Pohang has larger sea areas than other ports. Therefore, a partial modification of Pohang Traffic Safety Designated Area is proposed in this study with additional analysis of particular vessels’ traffic flow and non-sailing areas. However, a securing of safe navigation and prevention of maritime accident are not just affected by the volume of traffic, a modification of Traffic Safety Designated Area need to be considered both economic aspect and operational efficiency’s aspect due to its complexity.