Abstract: This paper aimed to explore the effect of Lactobacillus plantarum microcapsules fermentation on the quality of carrot chips, and the change of viable cell count under freeze-drying and simulated gastric juice conditions. In this study, Lactobacillus plantarum microcapsules were prepared by extrusion method using sodium alginate and isolated whey protein as wall materials. The carrot chips fermented with Lactobacillus plantarum microcapsules were used as experimental group and the carrot chips fermented without microcapsules were used as control group. The results showed that there were no significant differences in texture, color, total sugar content, carotene content and ascorbic acid content between test group and control group (P>0.05). In freeze-drying and simulated gastric juice environment, the number of viable bacteria in the test group was significantly higher than that in the control group, which remained (8.47±0.02) and (8.31±0.01) lg(CFU/g), respectively. Microencapsulated Lactobacillus plantarum fermentation had no prominent effect on the quality of carrot chips and could improve the resistance of Lactobacillus plantarum to adverse environments (such as freeze-drying and gastric juice).