Monthly algae samples in Hulanhe Wetland, Heilongjiang Province, were collected from May to October, 2009.A total of 158 taxa, belonging to 7 phyla, 8 classes, 14 orders, 23 families, 50 genera, 148 species and 10 varieties, were identified.The abundance of algae ranged from 469.55×10⁵-847.35×10⁵ cells/L.They were predominantly Bacillariophyta and Chlorophy-ta.The composition and biomass of the algae varied with the studying periods.Most of the algae were found in the site II.While the biomass in sites I and V was greater than that of other sites.Results showed that most taxa were common species and several in-dicator species for eutrophication and pollution were also found.According to the assessments using saprobic indicator, Shannon-Wiener diversity index and Pielou evenness index, the water in Hulanhe Wetland was of different degrees of pollution.