This study was carried out for three years (٣-٥ months every year) during maximum of aquatic hyphomycetes distribution ( in - Autumn and Winter), which related with the period of leaves-fall. We studied ٩٠ water samples taken from Banias River. We identified ٧٠ species of aquatic hyphomycetes by investigtion ٨٢٨ spore - isolates taken from water samples. The factors responsible for the occurrence of different patterns of their distribution have been determined. Therefore, this work is done for the first time in Syria and given an important side of ecological and botanical diversity in the waters of our country.