| Outcome Measures: |
Primary: HbA1c, HbA1c change from baseline to treatment Week 24 when receiving PEX 168 combined with metformin hydrochloride as compared to the placebo combined with metformin hydrochloride；PEX 168 as compared to the placebo, given on the basis of diet control and exercise., Baseline to Week24 | Secondary: The proportion of HbA1c <6.5% and <7% at the end of the analysis., The proportion of HbA1c \<6.5% and \<7% at the end of the analysis, and the proportion receiving salvage therapy., Baseline to Week24|Fasting plasma glucose, Baseline to Week52|6 points glucose of fingertip, Each test point of time was before breakfast, 2 hours after breakfast, before lunch,2 hours after lunch , dinner, 2 hours after dinner.This test was performed four times including baseline,V19,V31 and V59., Baseline to Week52|Postprandial blood glucose two hours, Baseline to Week52|Postprandial blood glucose two hours AUC, Baseline to Week52|Lipid, Baseline to Week52|Weight measured by standardized procedure., Collect weight data in the morning of screening period, baseline,4,8,12,18,24,38,52 weeks by standardized procedure., Baseline to Week52|Blood pressure, Collect blood pressure data in the morning of screening period, baseline,4,8,12,18,24,38,52 weeks by standardized procedure., Baseline to Week52|Number of Participants with Adverse Events as a Measure of Safety and Tolerability, Baseline to Week 56
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