The tourism industry is growing fast in the recent years. Every place is looking up on tourism and expect it to bring benefits for local developments; and the metropolitan areas are not exceptions. This research focus on the strategy of developing tourism in the metro-area. Although the metropolitan -area may not have significant amount of nature attractions, it has the advantage of being the ¡§gate¡¨ of all sorts of transportations. People have to pass through the metropolitan area in order to arrive their destination. Thus, the strategy of how to use this advantage and cooperate with the surrounding areas is essential. In this research, we call the above described metropolitan area the ¡§Metropolitan Tourist Gateway.¡¨ Also, we use the term ¡§Metropolitan Tourist Gateway Economy¡¨ to express the total product of the metropolitan tourism. The researcher uses TOWS matrix and three successful cases as the foundation of the tourist gateway strategies of Kaohsiung city; then use Delphi to generalize strategies from experts¡¦ opinions. In the end, the author concludes this research into six aspects and fourteen recommendations.