Thai Ornamental Fish Industry is a business that has a constant growth rate. Comparing with other countries in exporting the product to EU, Thailand is still considered as a small supplier. The objective of this thesis is to analyze an export potential of Thai Ornamental fish business in European market. The study employs three economic methods: Revealed Comparative Advantage (RCA), Value Chain Analysis, and SWOT analysis. Primary Data are obtained from in-depth interviews with various people in the ornamental fish industry. Secondary data used come from sources such as books, articles, magazines, and publications, while statistics and numbers depend on the information of the Department of Export promotion and the Department of Fisheries and compared with Indonesia, Philippines, Vietnam, Malaysia, and Singapore. The study finds out that Thai exporters work very well with the European importers. The strength of Thai exporters is the good source of product supply as Thailand is the best producer of ornamental fishes in Southeast Asia. The results shown that except for Philippines, other countries is both competitors and compliment in the same time. It also indicates that Thailand has a strong advantage over other Southeast Asian exporters in term of being a good producer. However, the government should keep document, law, up to date and support given to the industry. Traders who trade with the EU need to keep themselves alert by updating the new released documents all the time. If Thailand could keep itself up to date, it will be a great opportunity to a better achievement in the future.