A Trial Comparing the Efficacy and Safety of HR17031 Injection to INS068 Injection and to SHR20004 Injection in Patients With Type 2 Diabetes

Inclusion Criteria: 1. Male or female, 18-70 age years, both inclusive; 2. BMI is 20.0 to 40.0 kg/m2, both inclusive; 3. Type 2 diabetes mellitus diagnosed for at least 3 months before the screening visit; 4. HbA1c 7.5-11.0% (both inclusive) by local laboratory analysis; 5. At screening: 1\) Treatment with metformin alone on a stable dose (≥1500 mg or at the maximum tolerated dose \[MTD, ≥1000 mg\]) for ≥3 months, or 2) Treatment with metformin at the above dose level combined with a second OAD (AGI, SU, TZD, glinides, DPP-4i or SGLT2i) on a stable dose (≥half of the max approved dose according to local label, or at the MTD) for ≥3 months. Exclusion Criteria: 1. Use of systemic glucocorticoids within 3 months prior to the screening; 2. Use of weight loss drugs within 3 months prior to the screening. 3. Treatment with insulin within 1 year prior to screening (except for short-term or treatment for gestational diabetes); 4. Laboratory findings at the screening visit: * Amylase and/or lipase \>3 x upper limit of normal (ULN); * alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \>3 x ULN; * Moderate (3b) or severe renal failure or renal insufficiency or according to local contraindications for metformin; * Urinary albumin creatinine ratio (UACR) ≥300 mg/g; * Total bilirubin \>2.0 x ULN; * Calcitonin ≥50 ng/L; 5. Personal or family history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia type 2 (MEN2)； 6. Cardiac disorder defined as: congestive heart failure (NYHA class III-IV), diagnosis of unstable angina pectoris, cerebral stroke and/or myocardial infarction within the last 6 months prior to screening and/or planned coronary, carotid or peripheral artery revascularization procedures; 7. Severe uncontrolled treated or untreated hypertension (systolic blood pressure ≥160 mmHg or diastolic blood pressure ≥100 mmHg); 8. Proliferative retinopathy, maculopathy, painful diabetic neuropathy, diabetic foot ulcer or intermittent claudication requiring acute treatment; 9. History of pancreatitis (acute or chronic); 10. Pregnancy, breast-feeding, intention of becoming pregnant during the trial; or women of childbearing potential (WOCBP) or male subject not using adequate contraceptive measures；