Abstract:The component and stability of anthocyanidins in petals of sixteen Freesia refracta cultivars were analyzed by the specific color reactions and UV-visible spectrum. The results showed that the petal anthocyanidins in all cultivars belonged to flavonoids, including flavones, anthocyanins substance, and might contain isoflavones, but no flavonols, flavanones, flavanonols, chalcones and aurones. The cultivar of yellow petals lines also contained carotenoids. The anthocyanins under dark were more stable than that under light. And there were some effects of temperature on the stability of petal anthocyanidins.