Taiwan is an island surrounded by vast open sea. The impacts of typhoon on fish farms located near shore are usually tremendously severe and cause a variety of difficulty in developing a profitable cage aquaculture industry. Thus it is often regarded as one of highly risky ventures for fishermen. While Tai Ping Island is located at the tropic zone, the south most territory of the Republic of China, rendering a superior farming site for cage culture due to its clean water quality and nonexistence of typhoon. This study evaluates the possibility of establishing a series of cage culture in Tai Ping Island and estimates its economic feasibility according to the information obtained from Penghu cage farmers. Since Tai Ping Island is a military base, it is still prohibited for public visit at the present moment. Once the operation of offshore cage aquaculture at the Tai Ping Island is established, it may inspire other cooperates associated with the fishery industry to cluster on the Island. The researcher has served at the coastal guard office in Tai Ping Island for a year and thus quite familiar with land-based facilities, surrounding marina, and ecosystem etc. Through past experience in protecting cage farmers knowing that good farming site is relatively important for cage culture to success, this study intend to offer a good farming site to fish farmers in Taiwan. It is anticipated that a prosperous fish farming industry will develop in the near future.

The construction of traditional large-scale central power plants and the extension of power lines in Taiwan have tremendous difficulties in terms of land acquisition and environmental protection for a long time. In addition, one potential risk of energy supply is that over 95% of energy source is imported overseas. Therefore, the most important goal of Taiwan energy policy is to cut down the amount of energy import. To achieve the goal, it is important to explore innovatively local energy source by developing renewable and clean energy. Around the available renewable energy technologies, wind power technique is the most mature one in addition to hydraulic power generation. However due to limited land resources and restrictive regulations, it is expected that wind farm development in Taiwan can only be located offshore, instead of inland. Besides, a multi-functional wind farm site, which involves ocean farm ranch, is desirable to bring mutual benefits for both developers and local stake holders. The current study has used System Dynamics(SD) to analyze the influence of Multi-functional offshore wind farm on economic. We discuss the change of fish catch with building offshore wind farm¡Aand the change of economic output in open ocean with offshore wind farm combine marine ranching. It is therefore easy for the decision makers to comprehend the economical benefit difference if an offshore multi-functional wind farm were to develop in the future. The result of this study is building offshore wind farm will reduced the fishing revenue in a short time¡Abut the total fishing revenue will increased in a long time. The Multi-functional offshore wind farm has better economic output than offshore wind farm.