| Outcome Measures: |
Primary: the proportion of patients with HbA1c < 7.0% without experiencing hypoglycemia and without weight gain,with a superiority margin of 3%, the net difference in the proportion of patients with HbA1c \< 7.0% without experiencing hypoglycemia and without weight gain is more than 3%, 24 weeks | Secondary: the proportion of patients with hypoglycemia, the proportion of patients with hypoglycemia, 24 weeks|changes in HbA1c, changes in HbA1c, 24 weeks|changes from baseline in FPG(mmol/L), changes from baseline in FPG(mmol/L), 24 weeks|changes in body weight ( kilograms), changes in body weight( kilograms), 24 weeks|changes in prandial insulin dosage （per kilogram）, changes in prandial insulin dosage （per kilogram）, 24 weeks|changes in visceral as assessed by dual x-ray absorptiometry (DXA), changes in visceral as assessed by dual x-ray absorptiometry (DXA), 24 weeks|number of participants with abnormal laboratory values and/or adverse events that are related to treatment, number of participants with abnormal laboratory values and/or adverse events, 24 weeks|changes in serum c-peptide level, changes in serum c-peptide level, 24 weeks|changes in systolic pressure, changes in systolic pressure, 24 weeks|changes in diastolic pressure, changes in diastolic pressure, 24 weeks|changes in serum lipid profile, changes in serum lipid profile, 24 weeks
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