Ulcerative colitis(UC)is a chronic refractory non-specific intestinal inflammatory disease that is difficult to be cured.The discovery of new ulcerative colitis-related metabolite biomarkers may help further understand UC and facilitate early diagnosis.It may also provide a basis for explaining the mechanism of drug action in the treatment of UC.Compound Sophorae Decoction(CSD)is an empirical formula used in the clinical treatment of UC.Although it is known to be efficacious,its mechanism of action in the treat-ment of UC is unclear.The purpose of this study was to investigate the changes in endogenous substances in UC rats and the effects of CSD on metabolic pathways using the metabonomics approach.Metabolomics studies in rats with UC and normal rats were performed using LC-MS/MS.Rats with UC induced using TNBS enema were used as the study models.Metabolic profiling and pathway analys-is of biomarkers was performed using statistical and pathway enrichment analyses.36 screened potential biomarkers were found to be significantly different between the UC and the normal groups;it was also found that CSD could modulate the levels of these potential biomarkers.CSD was found to be efficacious in UC by regulating multiple metabolic pathways.