Yushan National Park is a high-altitude national park. It is a representative alpine ecosystem in Taiwan which preserves complete natural resources. According different plant communities under harsh climatic conditions that animal and plant resources are different from other ecosystems. So, long-term investigation and monitoring are highly desirable. In order to focus on the integration of biological and ecological research, there is necessary to use biological phase data as the cornerstone; therefore, this study carried out the plant survey along the trails of Tataka to established the dimension of the study area. We set 31 and 56 samples of overstory and understory; among these samples, total of 87 families, 215 genera, and 332 species were investigated. There are 118 endemic species in Tataka area (endemic rate 35.54%). We find 8 rare species here, Euonymus huangii(CR), Aster morrisonensis( EN), Gentiana tatakensis(VU), Swertia tozanensis(VU), Astragalus nokoensis(VU), Prunus obtusata(EN), Pyrus taiwanensis(CR) and Akebia trifoliata subsp. australis(NT). 19 naturalized species were recorded, and among them, Digitalis purpurea, Trifolium repens and Taraxacum officinale were the most wildly distributed along the trails in Tataka area. The results of cluster analysis showed that forest vegetation would be divided into F1 Alnus formosana type, F2 Salix fulvopubescens type, F3 Pinus armandii var. mastersiana - Pinus taiwanensis type, F4 Photinia niitakayamensis type and F5 Rhododendron pseudochrysanthum type. And the shrub-grass land would be separated into G1 Trifolium repens type, G2 Miscanthus transmorrisonensis- Yushania niitakayamensis type, G3 Digitalis purpurea type, G4 Carex tristachya var. pocilliformis type, G5 Urtica thunbergiana- Polygonum cuspidatum type, G6 Miscanthus transmorrisonensis - Deutzia pulchra type, G7 Bromus commutatus type and G8 Rhododendron lasiostylum-Pieris taiwanensis type. Keywords: naturalize species, rare species, cluster analysis, Tataka area