25.09%和12.42%。The essential structure and principle of ultrasonic wave dynamic countercurrent extraction equipment were briefly introduced, and the experiment on extraction effective components of chrysanthemum has been studied by water as solvent and chrysanthemum as stuff. The key factors, which influenced on extraction yield of water-solubility matter and flavonoid, such as extracting temperature, ratio of liquid to solid and extracting time, were studied. The extraction technology was chosen by orthogonal test. The chrysanthemum's effective components were extracted by the ultrasonic wave dynamic countercurrent extraction equipment. The optimum results showed that the ratio of liquid to material was 20 mL/g, the temperature was 70℃, the time was 30 min, and the extraction rate of extracts and flavonoids were respectively 25.09% and 12.42%. 