Diverrsity of Copepoda species had been studied in four freshwater bodies at Assiut, Upper Egypt during two years;
extending from 1991 -1993. The three indices, namely Margalefs taxa nchness index. Shanon-Wiener's index of general diversity and evenness index were applied for the four sites investigated. The physical factors, including temperature of air and water, pH, and conductivity, were recorded during the investigation. ANOVA F-test was performed to detect significant differences between the environmental factors measured in the four sites. Also, clustering analysis was used to show tile degree of simuarity of the abovementioned indices between the four investigated sites. The result revealed that three sites are closely similar, but different fron) site4.