Ecotourism is one of the fastest growing tourism that contributes to the national income and development. Taman Negara Kuala Koh (TNKK) is one of the ecotourism spots that offers fascinating view and resources to visitors. However, the satisfaction of the visitors to repeat and gain their benefit of enjoying ecotourism resources is depending on the existing capacity of natural resources and facilities provided at the park. The purpose of this study is to analyse the visitor’s perceptions and attitude toward sustainability of ecotourism resources in TNKK. A survey with closed ended questionnaire format was administered to 113 visitors during their visits to TNKK. SPSS 20.0 statistical software was used to carry out descriptive and inferential analysis to show the sample distribution, the differences in the perception of, and the levels of attitude towards sustainability of eco-tourism resources among visitors from different backgrounds. The results showed that the visitors have generally positive perceptions and attitudes toward the ecotourism resources conservation at TNKK even though the park was not well managed after devastating floods in 2014. Most of the visitors were addressed that TNKK management should improve the facilities and maintained the ecotourism resources. The study concluded that the visitors’ who visited TNKK were satisfied and willing to behave positively and revisit again in future. However, the park management should take the necessary efforts and actions in order to improve and sustain the ecotourism resource at TNKK. The fascinating view and resources in TNKK would attract more visitors to come thus indirectly will increase the fund for the park development in future.