The purpose of this study is to investigate and evaluate the effects of different interventions (1.continuous subcutaneous insulin infusion,2.continuous subcutaneous insulin infusion combined with rosiglitazone 3.continuous subcutaneous insulin infusion combined with metformin,4.continuous subcutaneous insulin infusion combined with α- thioctic acid daily injections,) on glycemic control, B-cell function and the remission rate in newly-diagnosed type 2 diabetic patients.