The study of nanx wudl indicates that the microbial floras of nanx wudl during fermentation are dominated by lactic acid bacteria, coccoi with gram positive and catalase positive, and yeast. Most of 269 isolates of lactic acid bacteria belong to Lactobacillus sake (37.6%) and Pediococcoi (21.6%). Furthermore,free glutamic acid,free histidine and essentional amino acid during fermented increase by 5.43,18.6 and 1.53 times, respectively. Thus the quality of the meat is raised greatly.