Abstract: Purpose: to research extraction technology of total flavones from stems and leaves of buckwheat. Method: Absorpti-ophotometry is applied to determine the content of rutin in buckwheat through L9（34）orthographic experiments. Result: The factorshaving effect on extraction productivity are the methanol content in solvant, the usage of solvant, extraction temperature andtime. Conclusion: The best extraction condition is to use 65% methanol 30 times to buckwheat in mass at 2530℃ for 46 h.

Key words: absorpti-ophotography, total flavones, stems and leaves of buckwheat, standard reference material of rutin, extraction technology