The algal community was studied in Heihe channel in Heilongjiang River during May to October of 2006-2007, accordingto the taxon and relations between algal assemblage structures and environmental variables based on data from six monitor stations,and was analyzed by use of Canonical correspondence analysis. It revealed that biology oxygen demand, total phosphorus, watertemperature and chemical oxygen demand from 7 water environmental variables are significant fractions of the distribution andvariation of algal community. CCA result indicates that, the algal community and space distribution are correlated with environmentalvariables, the variety of the algal community may become a useful monitor for river environments.