A Study of ZT002 Injection With Subjects With Overweight or Obesity

Inclusion Criteria: * Age ≥ 18 years and ≤ 75 years. * BMI ≥28 kg/m², or 24 kg/m2 ≤ BMI \< 28 kg/m2 with at least one comorbidity (pre-diabetes, hypertension, hyperlipidemia, fatty liver, obstructive sleep apnoea syndrome due to overweight, weight-bearing joint pain, etc.) * Weight change is not more than 5% with diet and exercise control alone within 3 months prior to screening. Exclusion Criteria: * Previous diagnosis of diabetes; or HbA1c ≥ 6. 5% or fasting blood glucose ≥ 7.0 mmol/L at screening. * Have used medicines or treatments that affect weight within 3 months prior to screening. * History of acute or chronic pancreatitis. * Personal or family (parents, children, and siblings) history of medullary thyroid cancer (MTC) or multiple endocrine neoplasia type II (MEN2). * History of definite mental disease within 2 years prior to screening or prior suicidal tendency or suicidal behavir; or PHQ-9 scale score is ≥ 15 at screening; or C-SSRS questionnaire is either class 4 or 5 at screening.