Abstract: The optimal conditions for the microwave assisted extraction of the flavonoids from leaves of Malus doumeri (Bois) Chev. were studied by the orthogonal experiment. The content of flavonoids in the extract was tested by spectrophotometry. Among the factors of test, the most significant was the radiation time. The optimal conditions for the extraction of flavonoids were as follows: adding 40 mL of 50% alcohol to the herbs (1 g) , dipping for 10 min at first, and then radiating for 4 min by microwave (microwave power was 240 W, interrupted-radiation ). The extract yield was 12.04%.

Key words: microwave assisted extraction, orthogonal experiment, leaves of Malus doumeri (Bois) Chev., flavonoids