Through the investigations on the geographical distribution of T. repestris, the habital factors of itsdistribution area,the results show that T. rupestris is strip--shaped distributed disjunctedly and sporadically inthe limestone regions of the eastern margin of Taihang mountain from 600 to 1500m in altitude, and it onlygrows in crevices of shadow slopes. where the climate is hot and rainy in the summer and dry and chilly inthe winter. There is a little soil in the crevices where T. rupestris grows. The soil is characterized by the lowwater-holding capacity, poor organic matter content and extremely high calcium concentration. The community of T. rupestris is composed of very limited number of species. Only 15 species which belonged tonine families and 11 genera were found in the three investigated qudrats. The floristic composition is verysimple and can be classified as typical dry shrubgrass vegetation type. Consequently, it is the special habitatthat may be the direct reason for the endangerment of T. rupestris.