Abstract: Flavonoids from leaves of Tulipa edulis were prepared with D-110 macroporous resin purification and 65% ethanol as extractant. The contents of flavonoids were determined by colorimetry. Their group characteristics were observed by infrared spectroscopy. The effects of temperature，pH，oxidant， reductant， illumination on their stability were investigated. The results showed that flavonoids from Tulipa edulis contained quercetin，rutin and other flavonoids，which had good alcohol solubility and water solubility. Flavonoids from Tulipa edulis were stable under the conditions of less than 85 ℃，natural light or shelter from light and acidic environment. The effect of oxidant H₂O₂ on their stability was not significant（P > 0. 05）. However，reductant Na₂SO₃ had a significant effect on their stability（P < 0. 05）. Therefore，in the test range，except for reducing agent Na₂SO₃，the flavonoids from Tulipa edulis were stable. They have good alcohol solubility and water solubility，which are suitable for development and utilization.

Key words: Tulipa edulis, flavonoids, preparation, characterization, stability