This study will evaluate the efficacy and safety of 100 mg DRBP108 tablets in the treatment of type 2 diabetes mellitus. A total of 750 subjects will be randomly allocated to three groups: DRBP108, active comparator and placebo comparator, in a 3:1:1 ratio. The purpose of this study is to evaluate whether 24 weeks of DRBP108 treatment will adequately reduce hemoglobin A1C levels in T2DM subjects.

Inclusion Criteria:

• Subjects who meet the World Health Organization(WHO) (1999) criteria for the diagnosis and classification criteria for type 2 diabetes;
• 18 ≤ age ≤ 75 years old, male or female;
• 19kg/m^2 ≤ Body Mass Index（BMI ）≤ 35kg/m^2;
• Subjects with type 2 diabetes mellitus who did not regularly take oral hypoglycemic drugs at least 8 weeks before screening (i.e., continuous medication for <1 week);
• 7.0% ≤ HbA1c ≤ 9.5%;
• Subjects voluntarily participate in the trial and sign the informed consent form;
• Subjects agree to use contraception from the signing of the informed consent form to the end of 1 month of the last medication.

Exclusion Criteria:

• FPG > 13.9 mmol/L;
• A history of severe hypoglycemia (that is, hypoglycemia with severe cognitive impairment and requiring other measures to help recover);
• A history of allergy to similar drugs (DPP-4 inhibitors) or those who have been judged by the investigator to be allergic to tested drugs;
• Uncured hyperthyroidism or other diseases may cause secondary blood sugar elevation;
• Continuous use of glucocorticoids within 4 weeks prior to screening or may uninterrupted use glucocorticoids ≥14 days during the trial (except for external use and inhalation)
• Subjects with chronic bowel disease associated with inflammatory bowel disease, partial intestinal obstruction, or obvious digestive and absorption disorders;
• Subjects with infectious diseases(all positive for HBsAg, HBeAg, HBcAb, or positive for hepatitis C antibody, or positive for anti-HIV antibody); Female subjects of childbearing age are positive in pregnancy test or are lactating;
• Subjects with a history of alcoholism or drug abuse;
• Subjects have the clinically significant unstable diseases;
• Not suitable for this clinical trial judged by the investigator.