Abstract: The paper,based on the floristic regionalization of China of Wu Zhengyi (1983) and modern natural environment character in Qinling Mt.and combine with the distribution of vegetation dominant and characteristic species of flora,analysed the character of each province by divi- ding the mountain into 2 regions,5 sub-regions and 7 provinces.The result confirms that Qinling Mt.is a major boundary line of the flora between south and north of China.