Abstract:In order to improve the quality of sauerkraut，a high-yield L-lactic acid bacteria，LZH-3，was isolated from natural fermented sauerkraut.Response surface method was used to optimize the liquid fermentation conditions.Through regression analysis，the optimal fermentation conditions were as follows：fermentation temperature was 33℃，inoculation amount was 3 %，initial pH value was 6.2，and fermentation time was 20h.The yield of L-lactate was 28.17 g/L，1.25 times of that before optimization.