This paper summarized the clinical experience of WANG Qingqi in the treatment of ulcerative colitis （UC） from the perspective of “half by treating dysentery， and half by treating ulcer”. The pathogenesis of UC is mostly the root deficiency and branch excess， with

qi

and blood depletion in the spleen and stomach as the root， and accumulation of damp-heat toxin as the branch. It is put forward that “half by treating dysentery， and half by treating ulcer” should be taken as the general principle of treatment， and staged treatment is recommended. During the attack period， half treatment is clearing heat， draining dampness and resolving toxins for dysentery， while half is from resolving toxins， eliminating abscess and expelling pus to treat ulcers， and the self-made

Modified Qingchang Decoction

（加减清肠汤） can be used. During the remission period， half is from supplementing， raising yang and rescuing from desertionthe to treat dysentery， while half is by fortifying the spleen， closing sore and engendering flesh to treat ulcers， and self-made

Modified Yangmo Decoction

（加减养膜汤） is suggested. Simultaneously， it is recommended to modify the formulas according to the symptoms and the stool properties， and use herbal paste to supplement deficiency， reinforce healthy

qi

， and prevent recurrence when the condition is stable.