In the modern world economic system, the tourism industry has been playing an enormous contribution to the prosperity of countries. Ethiopia with a rich stockpile of tourism resources is far behind in utilizing its tourism reserve for successful transformation from the yoke of poverty into prosperity. The availability of huge tourism potential and the inability to make use of it is a growing concern in the country's tourism industry and is a great motivation for this study too. The purpose of this study is to enquire in to the main determinants of performance that affect the operation of SMNP. Using a cross-sectional analysis this research examined the effects of SERVPERF dimensions on the performance of the park. Data collected from the staff members and tourists on variables were examined and their real effect on the overall and individual effect on the performance of SMNP was analyzed using SPSS version 23. The research findings prove the performance of SMNP is responsive to assurance, reliability, and tangibility dimensions. This study proved the question concerning the correlation between the performance of Simien Mountains National Park and SERVPERF dimensions.