Abstract: In this paper has stated the accoplisment of the studies on the dynamic changes of isozymes in peroxidase enzymes with the aid of polyaerylamide gel electrophoresis to leaf of 4 species on 10 populations of Blyxa in China. It has been pointed out that some populations of Blyxa echinosperma (C. B. Clarke) Hook. f. and B. aubergii Rich. had identical isozymogram band and close relations. The differences among them and B. japonica (Miq.) Maxim., B. leiosperma Koid. were distinctness. It has been pointed out that the characters of dynamic changes of isozymes correlated with the form characters of Blyxa. Number of isozymogram band possessed classificatory value.