Abstract: This paper introduces the fuzzy mathematical principles and two methods of comprehensive judgement that has been used the evaluation and comparison on the floristic abundance among the numerous regions.Through the analysis of number of the family, genus and species of seed plant flora of Guizhou, Yunnan, Sichuan, Guangxi, Hunan, Hubei, Guangdong, Anhui and Hainan and so forth provinces(regions), the results are in correspondance with the practicable circumstances, and the judged results of the fuzzy mathematical method Ⅱ of comprehensive judgement can reflect more the practicable circumstances than the method Ⅰ of that especially.

Key words: Floristic abundance, Comprehensive judgement