Abstract: The primary researches on the amount distributions and groups of purple non-sulfur bacteria in estuary sludge of Xinyang Shihe river were carried out.Sludge samples were collected at different seasons and different sites along the Shihe river.All 52 strains of separate cultures are primarily identified to 3 genus and 8 species of purple non-sulfur bacteria.Simultaneously,the physi-chemical indexes of water quality in Shihe river at different seasons and different sites,such as diaphaneity,water temperature,...