Abstract: The stability was studied with flavonoids extracted from Sarcandrae glabra Nahnl as indexes.The research results expressed that the ethanol extracting rate of flavonoids from Sarcandrae glabra Nahal is the highest,3.25 times more than the boiling water extraction.However for the eight kinds additives commonly used,sodium thiosnlphate and sodium sulfate make the flavonoids to decrease 21.98%～12.07%;The flavonidis contents become less when the raw material has been stored longer and the flavonoid’s contents descended also desrease in average 24.74% annually.The flavonoids assayed in the extraction liquid remain stable after being placed three years whereas the flavonoids in average decrease only 0.86% annually and also decrease only 0.82% after being heated to put out the germ.The strong light shooting for 30 hours can make the flavonoids to decrease averagely 10.27%.The flavonoids in the extraction liquid are most stable in pH 4～6.

Key words: flavonoids from Sarcandrae glabra, extraction liquid, stability, studies