Based on the city marketing perspective and customer-oriented behavior, the study attempts to figure out the critical factor of Keelung city marketing development. According to the collected and analyzed city marketing literature, this study develops four evaluation dimensions of Keelung city marketing, including image marketing, attraction marketing, infrastructure marketing, and people marketing. Then it comes out twenty criteria of four dimensions for Keelung city marketing. By using fuzzy analytic hierarchy process (FAHP), this study develops a fuzzy evaluation model of Keelung city marketing, taking tourists and residents as the example, comparing relative-weights by applying four evaluation dimensions and its criteria of fuzzy evaluation model. The results indicated that tourists considered “attraction marketing” to be the most important factor affecting Keelung city marketing. Moreover, residents weighted “image marketing” as the most important factor affecting Keelung city marketing. The results also prove the feasibility and practicality of the fuzzy evaluation procedure on Keelung city marketing proposed by this study. The fuzzy evaluation model will help governments and tourism industries to facilitate tourism promotion and marketing, and provide an important reference for improving traveling services.