Abstract: The extraction technology of total flavones in bitter buck-wheat peers was studied with ethonal as extractor. The best conditions were chosen through L9(34) orthographic experiments by adsorptive photospectrum based on rutin as standard substance. The results showed the first factor affecting extractor productivity was volume percentage of ethonal. The second and the third ones were extraction time and temperature respectively. The best extraction conditions were to use 65% ethonal as extractor with the ratio of 1:10 in mass at the temperature of 25～30℃ for 6h. The Second extraction productivity was 3.2% with the purity of 65%.

Key words: bitter buckwheat peers, total flavones, orthographic experiments, extraction technology