Objective To investigate the effect and safety of eurycoma longifolia in the treatment of erectile dysfunction(ED) in climacteric males.Methods One hundred and thirty-four climacteric males with ED were divided into the observation group and control group,67 cases in each group.The observation group was given the therapy of eurycoma longifolia and the control group was treated with testosterone undecanoate.After 3-month treatment,the scores of EHS,SHIM,AMS,EDITS,changes of serum to-tal testosterone(TT),free testesterone(FT),luteinizing hormone(LH),follicle stimulating hormone(FSH)and sex hormone-bind-ing globulin(SHGB)and complication occurrence rate were compared between the two groups.Results After 3-month treatment, the scores of EHS,SHIM,AMS and EDITS,and serum TT and FT levels in the two groups were significantly improved(P<0.05),moreover the results in the observation group were better than those in the control group(P<0.05);serum LH and FSH in the observation group had no obvious changes compared with before treatment(P>0.05),while which in the control group were significantly decreased compared with before treatment(P<0.05);serum SHGB level in the observation group was decreased com-pared with before treatment(P<0.05),while which in the control group was increased compared with before treatment(P<0.05);the EDITS score in the observation group was higher than that in the control group(P<0.01);the complication incidence rate in the observation group was 2.29 %,which was significantly lower than 16.41% in the control group(P<0.05).Conclusion Eury-coma longifolia can significantly improve sexuality and sexual function in climacteric males.