A Study of SYH2069 Injection in Participants With T2DM Not Controlled With Diet/Exercise Alone or Metformin

Inclusion Criteria: * 1\. Male or female participants, 18-75 years of age. * 2\. Confirmed as T2DM for at least 12 weeks. * 3\. Body Mass Index (BMI): 22 kg/m\^2 ≤ BMI ≤ 40 kg/m\^2. * 4\. Treated with lifestyle intervention and stable treatment with metformin at least 8 weeks prior to screening. * 5\. HbA1c 7.5-10.5% (both inclusive) at screening visit. * 6\. Able to understand the protocol, and voluntarily signed informed consent. Exclusion Criteria: * 1\. Type 1 diabetes or other specific types of diabetes. * 2\. Allergy to any active ingredient or any excipient of the investigational product, or presence of severe allergic diseases at screening. * 3\. Weight change \>5% within 1 month before screening. * 4\. History of a level 3 hypoglycemic episode within 6 months prior to screening. * 5\. Acute complications of diabetes occurred within 6 months prior to screening. * 6\. History of severe chronic diabetic complications within 6 months prior to screening, or have non-proliferative diabetic retinopathy that requires treatment during the study. * 7\. History of acute or chronic pancreatitis. * 8\. History of acute cardiovascular and cerebrovascular within 6 months prior to screening. * 9\. History of malignancy of any organ system within 5 years prior to screening, excluding cured basal cell carcinoma and carcinoma in situ. * 10\. History or family history of medullary thyroid carcinoma (MTC), thyroid C-cell hyperplasia, or multiple endocrine neoplasia type 2 (MEN2). * 11\. History of major surgery or suffered blood loss of more than 400 mL within 3 months prior to screening. * 12\. Pregnant or lactating woman. * 13\. Other conditions judged by the investigator to be unsuitable for participation in this trial.