Clostridioides difficile infection（CDI）is a common cause of antibiotic-associated diarrhea，posing a significant burden on global healthcare systems.Clostridioides difficile（C.difficile）spreads through spores outside the body，germinates and grows into vegetative cells in the intestines，and releases toxins to cause disease.Bile acids are crucial metabolites in the gut，where primary and secondary bile acids play important roles throughout the lifecycle of C.difficile.This article reviews bile acids metabolism，their impact on C.difficile，and how they influence CDI treatment through antibiotics and fecal microbiota transplantation（FMT）.The aim is to provide new insights and reference for clinical management and research of CDI.