The functions of museums include the preservation of objects, artifacts and cultural heritage, as well as the provision of leisure, educational and recreational activities and spaces. The Contingent Valuation Method (CVM) was adopted in this study to determine visitor demand and willingness to pay for interpretive service at the Botanical Garden of the National Museum of Natural Science. The results showed that most visitors to the Botanical Garden are accompanied by relatives and friends, with the main motivation for their visit being the augmentation of knowledge. More than 82% of surveyed visitors agreed or strongly agreed that interpretive service enhances the recreational experience and knowledge gained from the visit. In addition, nearly 70% of respondents indicated a need or strong need for professional interpretive service. Overall, nearly 60% of respondents expressed willingness to pay an extra fee for interpretive service at an average of NT$32.24.