Study of SHR-1209 in the Treatment of Hypercholesterolemia and Hyperlipidemia Ⅲ Stage

Inclusion Criteria: 1. Age ≥18 and ≤80 on the date of signing the informed consent, male or female; 2. Fasting LDL-C was ≥2.6mmol/L and \<4.9mmol/L at screening and randomization； 3. Those who understand the study procedures and methods, volunteer to participate in the study, and sign the informed consent in person. Exclusion Criteria: 1. Have the following diseases or treatment history :(1) Have known allergic reaction to experimental drugs, or have severe allergic reaction to other antibody drugs;(2) previous diagnosis of cardiac function as defined by the New York Heart Association (NYHA) grade III-IV; 2. Any of the laboratory indicators met the following criteria at screening or at random :(1) Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) exceeding 2 times the upper limit of normal (ULN), or total bilirubin exceeding 1.5 times the upper limit of normal (ULN);(2) Creatine kinase (CK) exceeds 3 times the upper limit of normal value (ULN); 3. General conditions :(1) the investigator judged that subcutaneous injection was not appropriate;(2) Fertile female subjects who did not use contraception within 4 weeks before screening;Or male or female subjects who do not agree to use high-efficiency contraceptives during the trial and for 24 weeks after the last dosing;(3) Women who are pregnant or lactating. 4. The Investigator determines that the subjects have poor compliance or have any factors that may prevent them from participating in the study, including, but not limited to, the study placing the subjects at unacceptable risk or possibly interfering with the study results.