At the stimulated conditions of the large intestines(anaerobic and 37℃),water extract of health adult feces was used to ferment a crude preparation of corn resistant starch.The amount of four short chain fatty acids in the fermentation system was measured to investigate the effects of four strains of exogenous lactic acid bacteria on the acid production.The results showed that the fecal extracts could ferment the resistant starch to produce four short chain fatty acids,which showed increased amount as the increase of the fermentation time.When fecal extract and one strain of Lactobacillus spp.were used to ferment the resistant starch,the amount of acetic acid in the fermentation system was enhanced while that of propionic or butyric acid was not impacted significantly.If fecal extract and one strain of Lactococcus spp.were used to ferment the resistant starch,the amount of propionic or butyric acid in the fermentation system was increased but that of acetic acid was not impacted.It was revealed that the exogenous lactic acid bacteria can influence on the acid production profiles of the resistant starch during its simulated fermentation in vitro.