The purpose of this study was to explore the relationships of visitor moral emotions and obligation to vandalism in Kenting forest recreation area. The moral emotions consist of shame, guilt, and embarrassment. Littering and flower picking are regarded as vandalism. A moral emotion, obligation, and vandalism questionnaire was used to collect the self-report data of 460 visitors. The data were analyzed by multiple regression analysis. The results indicated that moral emotions and obligation significantly contributed to the littering and flower picking behaviors. Namely, the stronger the visitor moral emotions and obligation arc, the lower the possibilities of littering and flower picking are. Implications of the results are further discussed.