Chemically Glitazones belong to Thi-azolidinediones. Glitazones enhance the sensitivity of target tissues to insulin and reduce insulin resistance. They, celled insulin sensitizers, are a new class of oral hypoglycemics. These agents can't reduce the blood glucose values either in normal animal or I type diabetic animal, but do have good effects on spontaneous diabetic animal and artificial insulin resistance animal. The research on insulin resistance needs euglycemic clamp for determination and the main index of assessing euglycemicclamp is glucose infusion rate in stable state. So far, the hypoglycemic mechanism of glitazones has been believed to be associated with PPARs(Peroxi-some Proliferator-Activated Receptors ). Gli-taziones act on PPAR Y, play an indirect part in insulin signal transduction and enhance the action of insulin. However, the precise mechanism still remains unknown.