This clinical trial is a multicenter, randomized, double-blind, controlled phase III clinical study

Inclusion Criteria:

(1）The patient understands and voluntarily signs the Informed Consent Form (ICF), and has the willingness and ability to complete the regular visits,treatment plans, laboratory tests and other experimental procedures required by the program. (2) Male or female patients aged ≥18 and ≤75 years at the time of signing the ICF. (3) Meet Hanifin-Rajka diagnostic criteria at screening and have atopic dermatitis （AD) symptoms for at least 1 year prior to baseline. (4) At screening and baseline, meets criteria for moderately severe AD based on the investigator's assessment of 3 of the following:Eczema area and severity index (EASI) score ≥12;Psoriasis Area Severity Index (IGA) score ≥3;AD involvement in ≥10% of the Body Surface Area (BSA). (5) Recent (within 1 year prior to screening) topical treatment for AD with inadequate or intolerant clinical response, as determined by the investigator

Exclusion Criteria:

(1) Inability to swallow the test drug or refractory nausea and vomiting, malabsorption, extracorporeal biliary shunt, or the presence of a gastrointestinal disorder (e.g., Crohn's disease, ulcerative colitis, or short bowel syndrome) or other malabsorption condition that interferes with the absorption of the drug; (2) Current or history of lymphoproliferative disorders or presence of signs or symptoms suggestive of possible lymphoproliferative disorders of lymphoid tissue, including lymphadenopathy or splenomegaly; malignancies of any kind, or a history of any malignancy within the 5 years prior to Screening (except for completely resected carcinoma in situ of the cervix or non-metastatic squamous cell or basal cell carcinoma of the skin or papillary carcinoma of the thyroid gland); (3) Patients with prior thromboembolism (including deep vein thrombosis, pulmonary embolism, arterial thrombosis, etc.) or other high-risk groups prone to thromboembolism; (4) Patients with a history of herpes virus infection within the last 1 month or those with recurrent episodes of herpes zoster (≥2), disseminated herpes zoster, disseminated herpes simplex, or those for whom herpes zoster or herpes simplex infections cannot be excluded at this time;