1.Grading by condition 1.Mild diarrhea less than 3 times a day, light or no blood in stool, no fever, rapid pulse or anemia, normal blood sedimentation. 2.Severe diarrhea more than 6 times a day, pulse above 90 times/minute, HB30mm/h. 3.Moderate border between mild and severe. Second, according to the clinical process of typing 1, the initial onset of the disease without previous medical history, the severity of the disease varies, can be transformed into chronic relapsing type and chronic persistent type. 2. Chronic relapsing type is the most common clinical condition. The symptoms are mild, and there is often a remission period of varying length after treatment, with a general duration of 3-4 weeks. 3, chronic persistent type. 4.Acute fulminant type. 3, according to the scope of the lesion 1, proctitis. 2.Sigmoid colitis. 3.Left hemicolectomy. 4.Right hemicolectitis. 5.Regional colitis. 6.Whole colitis.