Abstract: Taking fresh wild Pteridium aquilinum as raw material, Lactobacillus plantarum Z17 was inoculated for fermentation, and natural fermentation was used as control. The fermentation was carried out for 42 days under the same conditions. The effects of Lactobacillus plantarum Z17 on the pH, total acid, amino acid nitrogen, color, browning index, chewiness and viscosity of Pteridium aquilinum during the fermentation process were investigated. The results showed: After inoculation with Z17, the rate of pH decrease and the increase rate of reducing sugar content of Pteridium aquilinum were significantly better than natural fermentation; The total acid content in the fermentation process was significantly improved, especially the lactic acid content increased by 2.3 times; After fermentation, the sensory evaluations of Pteridium aquilinum inoculated with Z17 and naturally fermented Pteridium aquilinum were 88.34±3.74 and 65.23±2.68, respectively, the chewiness and hardness of bracken inoculated with Z17 were significantly improved(P<0.05). In summary, the inoculation of Lactobacillus plantarum can effectively shorten the fermentation cycle, improve the edible safety of kimchi, and also help improve the quality of fermented bracken.