In laboratory, by using the water from Taihu Lake after filtrated as background experimental sample, and the experimental environmental condition simulate to the algae growth quickly status of Taihu Lake. In the background experimental sample the phosphates, detergent and dominance algae were used, then the algae growth for 12 days were surveyed. The algae growth results show that the phosphorus in detergents has a significant effect on algae growth in some degree. Especially, when the phosphate concentration less then 0.08mg/L, the phosphate in detergents are the main factor affecting the algae growth.