Abstract:This study aimed to obtain lactic acid bacteria suitable for oat plant-based fermentation with strong acid production capacity，tolerance，and functionality. Using sour porridge and sauerkraut as the target lactic acid bacteria isolation sources，this study initially screened out the lactic acid bacteria using the calcium soluble circle method，domesticated for low sugar fermentation，and measured for acid and bile salt tolerance，antioxidant capacity，fermentation characteristics，and acid production capacity.Morphological and 16S rDNA analyses were performed on the finally obtained two Lactobacillus strains.The results showed that the two highperformance lactic acid bacteria were both Lactiplantibacillus plantarun with the numbers YGF-8 and YGF-13，respectively. The minimum tolerated pH of both low sugar lactic acid bacteria was 2.5 and they could grow normally in MRS medium with 0.5% bile salt addition and 7.5% NaCl addition.The scavenging rates of ABTS+，DPPH，and O2- radicals were 65.36% and 57.56%，92.49% and 92.34%，and 92.45% and 91.97%，respectively. The capacity of producing β-glucosidase was 26.23 IU/mL and 26.52 IU/mL，respectively. L.plantarun YGF-8 and YGF-13 can be used for the fermentation of oat plant-based fermentation products，laying the foundation for the deep processing of oat fermentation and enriching lactic acid bacteria germplasm resources.