The active compounds from dry powder of Acorus calamus were extracted with six kinds of organic solvents,and methanol extract had the best inhibition effect on the alga,with inhibition rate of 98.4% in 48h.

• 用6种有机溶剂提取菖蒲干粉中的抑藻活性物质；显示甲醇提取物的抑藻效果最好；48h抑藻率为98.；4%25。