The obsective of this study is to compare domestic chicory root powder with foreign chicoryfructooligosaccharide (FOS) in effect of microflora in piglet feces and to sustitude domestic chicory forforeign chicory. The prebiotic effects of FOS from chicory (Chicorium intybus) was evaluated for livestock feedsupplement. Chicory is a turberous plants containing inulin ,with high fructose contents its root. Piglets werefed one of three diets for 5 weeks, a control diet, a basal diet containing 0.2% of foreign chicory FOS anda basal diet containing 0.3% of domestic chicory root powder. Prebiotic effects of foreign chicory FOS anddomestic chicory root powder were examined for their effects on the growth of fecal microorganism withpiglet along with measuring pH changes of collected piglet feces during experimental periods (5 weeks). Theresults showed that the growth of Lactic acid bacteria (LAB) was significantly increased after feeding chicoryFOS and chicory root powder supplemented feeds, and the increased occupancy ratio of LAB in the feceswas observed. However, the occupancy ratio of Escherichia coli in piglet feces was continuously declined aftertreating feeds containing chicory FOS and root powder. No remarkable changes were observed in the growthof Clostridium perfringens throughout the experimental periods. A significantly decreased pH of the collectedfeces was observed after feeding chicory FOS and chicory root powder supplemented feeds. It wasnoteworthy that feeding chicory root powder more effectively decreased pH levels than those of chicory FOS.As a result of this it was expected that FOS from chicory could be applicable to pigs as prebiotics.