A Study to Evaluate the Safety and Tolerability of Multiple Dose of IBI3002 in Patients With Atopic Dermatitis

Inclusion Criteria: 1. Between 18 and 65 years. 2. Weight ≥40kg. 3. Meet the diagnostic criteria of the Hannifin \& Rajka criteria, and have been diagnosed with AD for ≥12 months at screening. If determined by Investigators, previous diagnostic terms like "dermatitis" and "eczema" are also acceptable. 4. Have an Eczema area and severity index (EASI) score ≥16, the Investigator´s Global Assessment score ≥3, and the involved Body Surface Area (BSA) ≥10% at screening and randomization. Exclusion Criteria: 1. Having any disease that have an impact on the participant's own safety or participation in the study. Including but not limited to mental disorders, diseases of the central nervous system, cardiovascular system, digestive system, respiratory system, urinary system, blood system or metabolic system, in the opinion of Investigator. 2. Participants with a known history of active tuberculosis or clinically suspected manifestations of tuberculosis (including but not limited to pulmonary tuberculosis, lymph node tuberculosis, tuberculous pleurisy, etc.); Or chest imaging suggests the existence of suspected evidence of tuberculosis; Or there is any other clinical evidence of latent tuberculosis. Those with positive T-SPOT.TB need to receive preventive anti-tuberculosis treatment from 4 weeks before the first dose until the end of the study. If the participant is judged by Investigator to be intolerant to preventive anti-tuberculosis treatment, they should not be included in the study either. 3. A history of malignant tumors, except for resected or cured localized basal cell carcinoma (BCC) or squamous cell carcinoma (SCC) of the skin. 4. The peripheral blood white blood cells or neutrophils are lower than the lower limit of the normal value, at screening or randomization. 5. The co-existing of any other skin comorbidities that may interfere with the assessment related to AD, in the opinion of Investigators. The above information is not intended to contain all considerations relevant to a participant's potential participation in this trial.