In order to optimize the extracting technology of flavonoid in the GBE of distilled lactone, the orthogonal experimental design was adopted in the extraction and extracting and crystallizing processes. Results proved that the best extraction technology was extraction temperature was 55℃,extraction time was 4.0h,extraction times were 1, the ratio of liquid to solid was 30∶1;the best extracting and crystallizing technology was extracting and crystallizing pressure was 15Mpa,extracting and crystallizing temper...