Study of SHR-1209 Administered by Single-site or Multiple-site Subcutaneous Injections in Healthy Volunteers

Inclusion Criteria: 1. Understanding the research procedures and methods, being able to complete the research in accordance with the procedure requirements, and sign the informed consent; 2. The age on the date of signing the informed consent must be ≥18 years old and ≤55 years old; 3. Body mass index (BMI) at screening period must be ≥19.0 kg/m2 and \<28.0 kg/m2, weight of male must≥ 50.0 kg and \<90.0 kg, and female≥ 45.0 kg and \<90.0 kg; 4. The subjects and their female partners are willing to have no reproductive plan from signing the informed consent to 16 weeks after the last administration of the study drug, and voluntarily take effective contraceptive measures and do not plan to donate sperm or ovum. Exclusion Criteria: 1. Serious infection within 3 months before screening; 2. History of food or drug allergy or atopic allergic disease (asthma, urticaria); 3. Positive blood pregnancy test; 4. Have a history of drug abuse; 5. Women who are pregnant or breastfeeding; 6. Subjects who are considered by the investigator to have any other factors which are not suitable for participating in this study.