Abstract: Shishan is part of the Kam-Yunnania (Sikang-Yunnan ancient landmass) , which has an ancient geological history. After the Tertiary, it keeps relatively stable and has advantageous physiography conditions, its flora did not suffer severe danger by the glacier during the Quaternary. The study area is located in the southern portion of the middle subtropical region, it covers an area of ca. 100 km2 and reaches 2419.8 m in altitude. Its general climate is similar to that of Kunming, with only two seasons: dry and wet. The annual average temperate and rainfall are respectively 15.1 °C and 1004 mm, the solar radiation energy is up to 127 Kcal./cm2 annually. Floristically, it is situated in C Yunnan subregion, Yunnan plateau region belonging to Sino-Himalayan forest subkingdom of Holarctic kingdom. Due to the location of the transition of the mountain and it is a relatively undisturbed area in C Yunnan, the investigation on the Shishan mountain vegetation and flora is helpful for us to understand the phytogeographical significance of this area and its adjacent regions.

Key words: Shishan mountain

摘要： 狮山地处康滇古陆边缘，自然地理条件优越；植被以元江栲Castanopsis orthacantha林为主，另有云南松Pinus yunnanensis林及华山松Pinus armandii林，还有名类灌丛草坡等，分布混杂。元江栲林结构复杂，种类丰富，种系饱和度大，计有种子植物137科，537属,1157种。区系起源古老，为康滇古陆的衍生区系，种类以温带成分为多;植被优势种则为狭域的古老类型，区系具明显过渡性及热带亲缘，含不少与华东及滇中周围的地理替代种；从范围看，狮山与热亚及东亚的区系联系最密切（分别占12.59％、27.80％），在东亚范围则主要是中国一喜马拉雅成分，其中滇一横断山脉、滇一华中和云贵高原成分最多，分别占狮山中国特有种总数的22.52％、21.37％、16.99％。狮山区系是滇中区系的缩影，和整个滇中一样具有独特古老等特征，同时，对认识中国西部亚热带常绿阔叶林区系也有一定意义。

关键词: 滇中狮山, 植物区系地理