The mechanism of Ulcerative colitis was explained.It was believed that spleen insufficiency was the fundamental of Ulcerative colitis damp-heat was the incidental

and blood stasis was the local pathological change.Applying different methods in treating Ulcerative colitis according to stages and types.Ulcerative colitis was divided into six patterns:damp-heat in large intestine

liver depression and spleen insufficiency

qi stagnation and blood stasis

cold-heat in complexity

weakness of spleen and stomach

deficiency of spleen and kidney yang.In order to enhancing the therapeutic effect

emphasizing formula differentiation was based on syndrome differentiation in treatment.