The agricultural production function of indigene's reservation land will be declining after Taiwan entered the World Trade Organization. As the govemment has been trying to find a new way out for Taiwan's agriculture, it is also necessary to have a new interpretation for the function of the indigene's reservation land. This study selected the Bakulas indigene's reservation land in Nantou County as the study area, and took the residents of Taichung city as the respondents for a questionnaire survey during summer break in 2003 to collect data of 267 effective samples for analyzing the potential market of ecotourism development on indigene's reservation land. The purpose of this research was based on the idea of ecotourism development to analyze its potential market. 1. The potential ecotourists have shown their supports to and given their amounts of willingness to pay to 14assumed activities at Bakulas indigene's reservation land in Nantou County, which means that a potential market primarily exists. 2. The target market of the promotion of the ecotourism in the reserves should be focused on those who are nature lovers, such as visitors of outdoor mountain climbing. The issue of charging ecotourists would be persuadable if the ecotourism activity design is directed toward the enhancement of naturalness in the reserves, such as a tour in the tribe community and wild vegetables identifying and collecting. 3. When arranged those 14 simulated activities into a 2-day trip program for potential ecotourists plus a show of real pictures and then asked the amounts of their willingness to pay to that trip. The average amount was about NT$2,000.00 per person for each trip. If the replied frequency of participation in that trip was once a month, which could be even a little bit over-estimated and need some discount, yet it has shown a big potential market.