Microwave-assisted extraction of flavonoids from the stem of Actinidia arguta was explored. Effect of operation conditions on extraction ratio of flavonoids,such as microwave power,treatment time,ethanol concentration and liquid ratio were studied by using single factor test. Taking extraction ratio of flavonoids as index,orthogonal test was designed based on single factor test. Results showed that the highest extraction yield can be obtained when microwave power was 300W,treatment time was 5min,ethanol con...