Abstract:Lysinibacillus capsici GXUN74704 was isolated and identified from pickled Chinese cabbage products and artificially inoculated into the leaf mustard fermentation system.It was found that the content of nitrite was always less than 25 mg/kg.The strain inhibited the formation of high nitrite peaks during the fermentation process，improving the safety of fermented leaf mustard products.After 5 days of fermentation，the glucose content in the fermentation system inoculated with L.capsici GXUN74704 was close to 0.1 g/L，which indicated that the strain accelerated the utilization of glucose and shortened the fermentation period without affecting the content of probiotics in the fermentation system.The results of high-throughput sequencing showed that species richness and diversity in the leaf mustard fermentation system inoculated with L.capsici GXUN74704 were higher than those in the natural fermentation system.L.capsici GXUN74704 had potential applications and a development value in leaf mustard fermentation，improving the safety of fermented leaf mustard products.