The simultaneous extraction of chlorogenic acid and luteoloside from Chrysanthemum indicum L.by ultrasonic-assisted extraction technology was studied.The effects of several influential parameters of the ultrasonic-assisted extraction procedure were investigated by orthogonal array design experiment.The results showed optimum extract conditions were that the extraction solvent was 75% ethanol,the ratio of material to solvent was 1:400,the extraction time was 90 min and the extraction temperature was 50 ℃.Under the optimum conditions of ultraso...