Objective:We sought to summarize frequently effective traditional Chinese drug and prescription for Ulcerative Colitis （UC） as well as to sum up clinical classification and regularity of compatibility though analysis of clinical data. Methods: Prescriptions for oral use were searched and screened from acquired papers. Cluster analysis was used to explored frequently effective traditional Chinese drug

prescription and regularity of compatibility. Conclusion: The main pathogenesis of UC is spleen-asthenia with excessive damp

cold-heat complex. The foundational prescription is Black plum pill uniting Decoction of Four Mild Drugs.