A Study for HSK47388 in Participants With Ulcerative Colitis

Who May Qualify: 1. Written willing to sign a consent form must be obtained 2. Male or female, ≥18 years old and ≤75 years old 3. Willing and able to comply with study-specific procedures and the requirements of study protocol. 4. Diagnosis of ulcerative colitis (UC) 5. Baseline modified Mayo score of 5 to 9 and the endoscopy subscore 2 to 3 6. Demonstrated an inadequate response, loss of response, or failure to tolerate previous conventional therapy or advanced therapy. Who Should NOT Join This Trial: 1. Subjects have used treatments within the time frame specified in protocol prior to the baseline visit 2. Diagnosis of indeterminate colitis, ischemic colitis, Crohn's colitis or clinical findings suggestive of Crohn's disease 3. Participants with current or prior diagnosis of fulminant colitis and/or toxic megacolon 4. Presence of a stoma 5. Presence or history of a fistula 6. Intra-abdominal or other major surgery performed within 12 weeks before baseline 7. History of extensive colonic resection 8. Subjects have laboratory values meeting the criteria in protocol 9. Concurrent conditions and history of other diseases as described in protocol Always talk to your doctor about whether this trial is right for you.