Abstract: The fermentation strain and material basis of fermented rice-washing water of Dai were preliminary studied for supporting the development and application of fermented rice-washing water of Dai in the field of daily chemicals. The fermentation strains were isolated from the sample of fermented rice-washing water of Dai in Xishuangbanna and identified by phylogenetic analyses of 16 SrRNA gene and 26 R rRNA gene respectively, combined with phenotypic characteristics.The content of total nitrogen and non-protein nitrogen were detected by Kjeldahl determination and the concentration of lactic acid and acetic acid were detected by HPLC.The results showed that a lactic acid bacteria and a yeast were isolated from the sample of fermented rice-washing water and were primarily identified as Lactobacillus sp.and Pichia sp..Compared with unfermented rice-washing water, the non-protein nitrogen was increased 105%, the protein nitrogen was increased 77%, the lactic acid and acetic acid were increased 551% and 342% respectively after 48 h fermentation.