Nantzuhsienchi conservation research station is located in the northwest region of Yushan national park. It is an area with fewer human activities but containing many mammals and diversified plant resources in this region. Since 2017, Nantzuhsienchi conservation research station has been constructed to serve as a scientific research base for the purposes of scientific research and environmental education. Therefore, the background knowledge of biota in this region is needed for the development of the above activities. Compared with the nearby Tataka recreation area, which have relatively long-term butterfly fauna investigation, the information of butterfly fauna in Nantzuhsienchi area is lacking, remaining to be explored. In this study, a survey including four line transects and four bait traps was set up in the Nantzuhsienchi forest road to investigate butterfly fauna in this area. From January to December, 2021, a total of 390 individuals of butterflies were recorded, and they were classified into 71 species in six families. Based on the results of previous investigations and this research, there are a total of 164 species of butterflies recorded in the Tataka area. The butterfly species richness and Shannon-Weiner index of the line transect survey peaked in June; the abundance peaked in July. This result is consistent with the flowering time of the main nectar plants in this area, concentrated in spring and early summer. Among 22 newly recorded species of butterflies in this study, Aporia gigantea cheni, whose records are mostly distributed in the southern region of Yushan national park in the past, now firstly recorded in the northwestern region, and this record is the orthernmost one in Taiwan. In addition, two new hostplants utilization records were also discovered in this study: (1) the hostplant of Ypthima conjuncta yamanakai was confirmed for the first time, ; a female was sighted laying eggs on Oplismenus undulatifolius (Poaceae) in October during the survey; (2) the caterpillar of Rapala nissa hirayamana fed on the flowers of Vaccinium randaiense, which is the first record of utilizing Ericaceae plant for this species.