Abstract: The effect of exogenous ethrel,GA_3 and boric acid on physiology and anthesis of Lycoris radiata were studied.Results showed that applicaticon of ethrel within the concentration of 100～200 mg/L and 50～200 mg/L GA_3 improved chlorophyll content.All concentration of ethrel lowered caroteniod content.Boric acid of concentration of 150 mg/L and (200 mg/L) improve caroteniod content.Ethrel improve MDA content and lowered SOD activity.GA_3 is in opposition with ethrel.With the treatment concentration of ethrel improved GA_3 and IAA content in leaves reduced gradually.ABA content in leaves is the highest when ethrel treat with 150 mg/L.The higher concentration of exogenous GA_3,the higher GA_3 content and the lower ABA content in leaves.IAA content in leaves were significantly improved by application of GA_3 at 100 mg/L.With the treatment concentration of boric acid improved,ABA and IAA content all rised in leaves,but GA_3 content doesn′t change obviously.ABA/GA_3 and (ABA/IAA) improved with the treatment concentration of boric acid arised.The treatment concentration of GA_3 had no effects on ABA/IAA.The anthesis advance 7 d after applicated ethrel at 150 mg/L and advance 16 d after applicated ethrel at 200 mg/L.Applicated GA_3 had no significantly effect on anthesis.The anthesis advance 5 d after applicated boric acid at (200 mg/L).