| Outcome Measures: |
Primary: the effect of dapagliflozin combined with CSII on glucose profile, To compare the effect of dapagliflozin combined with CSII and CSII alone on glucose profile(the mean amplitude of glycemic excursions(MAGE),The 24-hrs mean glucose(MG) ) in newly diagnosed type 2 diabetes mellitus by continuous glucose monitoring system, 5 weeks | Secondary: the effects of dapagliflozin combined with CSII on weight, To compare the effect of dapagliflozin combined with CSII and CSII alone on weight in kilogram, 5 weeks|the effects of dapagliflozin combined with CSII on blood pressure, To compare the effect of dapagliflozin combined with CSII and CSII alone on blood pressure in mmHg, 5 weeks|the effects of dapagliflozin combined with CSII on lipid metabolism(total cholesterol in mmol/l, total glyceride in mmol/l), To compare the effect of dapagliflozin combined with CSII and CSII alone on lipid metabolism(total cholesterol in mmol/l, total glyceride in mmol/l), 5 weeks
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