Abstract: This paper reported the result of classifying 17 species and varieties of Azolla based on priniciple of quantitative classification 13 indexs were determined according to the pattern of the different numbers of septa inside the glochidia of massulea,a male reproductive organ of Azolla,and the quantity of glochidia was counted for clustering analysis by using pattern analytic package.In relation of fusion group with interspecific affinity and specific recognition,the quantitative classification is regarded as an ideal way for Azolla classification and provides a prelimlnary foundation in application of computer to the study on Azolla.