Evaluation of 611 in Chinese Children With Moderate to Severe Atopic Dermatitis(AD)

This study is a 2-part (parts A and B) study.The primary objective of the study is to evaluate the efficacy of 611 in Chinese Children with moderate to severe atopic dermatitis (AD).

Inclusion Criteria: 1. The participants and their legally acceptable representatives are able to understand and comply with the research procedures, agree to participate in the research, and sign the Informed Consent Form (ICF) ; 2. When signing the informed consent form, the age should be ≥ 2 years old and \< 6 years old for part A, and ≥ 2 years old and \< 12 years old for part B. any gender, with body weight ≥ 15 kg at baseline; 3. During the screening process, patients were diagnosed with atopic dermatitis (AD) according to the Hanifin - Rajka criteria, and their AD medical history was evaluated by researchers to be ≥ 6 months for participants aged ≥2 years to \