Abstract:In this study, mycrocysis aeruginosa, a dominate species in the cyanobacterial bloom, was collected during blooming in 2010in Gaozhou reservoir. Isolation, purification and cultivation of mycrocysis aeruginosa were conducted in laboratory to study effects of light density and temperature on growth rate of mycrocysis aeruginosa in growth cultures with various nitrogen and phosphorus concentration. A relatively high growth rate of mycrocysis aeruginosa was found under the condition of 0.6mmol/L nitrogen, 24mmol/L phosphorus, 30mmol/(m2×s) light density and 25~30℃. The most suitable nitrogen and phosphorus concentration of mycrocysis aeruginosa in Gaozhou reservoir was higher than that in Tien Lake, Erhai Lake and Chaohu lake, while the most suitable concentration was lower than that in Taihu Lake. The optimum light density and temperature for growth of mycrocysis aeruginosa were 20~30℃similar to which in Erhai Lake and Tien Lake.