The present study on 24 cases disclosed that the erythrocyte deformability(ED) of patients with acute myocardial infarction (AMI) was significantly lower than normal control. After incubate the patients' erythrocyte with Prop-lene Glycol Mannituse Sulfate(PGMS) and Pro-plene Glycol Alginate Sudium Sulfate (PSS ) , The ED was significantly higher than that of in-cubated without drug. PGMS was more effi-cious. The result indicated that PGMS and PSS may have high value in improving the microcir-culation of patient with AMI, increasing the blood flow of capilliaries in ischemic myocardium and reducing the area of infarction.