Inclusion Criteria:  Male or female adult subjects ≥ 18 years of age If subjects are female of childbearing potential, subjects must be negative on the pregnancy test and abstain from coitus or use effective contraceptive measures during the entire study until 30 days after the investigational product is discontinued Subjects diagnosed with T2DM, with a HbA1c level of 7.5-11% (inclusive) at screening and 7.0-10.5% (inclusive) at enrollment Subjects who are treated with a stable dose of ≥ 1500 mg/day metformin monotherapy along with diet and exercise counseling for at least 8 weeks prior to screening Subjects with a BMI of 19-35kg/m2 (inclusive) at screening If applicable, taking stable doses of treatment for dyslipidemia and/or hypertension for 30 days prior to screening. Subjects who do not need to be treated with dyslipidemia or hypertension by the investigator's judgment are also eligible for the study  Exclusion Criteria:  History of diabetes insipidus Definitive diagnosis of Type 1 diabetes mellitus, maturity-onset diabetes of the young (MODY), or secondary diabetes mellitus Symptoms of diabetes mellitus inadequate control, resulting in the inability to participate in this trial, including but not limited to significant polyuria and polydipsia within 3 months prior to the screening visit and weight loss > 10% History of urinary tract or genital infection within 6 months prior to screening, or ≥ 3 times of urinary tract or genital infections within 6 months prior to screening that require treatments Two or more consecutive SMBG measures ≥ 250 mg/dL (13.9 mmol/L) prior to randomization (run-in period) accompanied by clinical signs or symptoms of hyperglycemia prior to randomization, including weight loss, blurred vision, increased thirst, increased urination, or fatigue History of diabetic ketoacidosis or hyperosmolar non-ketonic coma within 6 months prior to screening History of severe fracture secondary to osteoporosis Poorly controlled hypertension: blood pressure systolic ≥ 160 mmHg and/or blood pressure diastolic ≥ 100 mmHg Surgical history resulting in unstable weight or scheduled for such surgery during the study period Any unstable endocrine, psychiatric, or rheumatoid disease as assessed by the investigator Possible risk of dehydration or body fluid exhaustion based on the investigator's judgment that may affect the interpretation of efficacy or safety data Currently having or had a history of alcohol or drug abuse within the past 6 months Presence of the following cardiovascular/vascular disorders within 6 months prior to screening: Unstable or rapidly progressive renal disorder Congenital renal glycosuria Major liver disease, including but not limited to hepatitis chronic active and/or significant hepatic function abnormal, including ALT and/or AST ≥ 3 × upper limit of normal (ULN) and/or total bilirubin ≥ 2 × ULN; or medical history of severe hepatobiliary disease; or history of any drug-related hepatotoxicity; Current positive serological test result for infectious hepatitis, including known positivity to hepatitis B surface antigen and hepatitis C antibody