Objective: Post-voided dribbling(PVD)in men is the symptom of experiencing involuntary loss of urine immediately after a person has finished passing urine,usually after leaving the toilet which distinguished from terminal dribbling.Researches on the PVD are very limited because no proper tool to evaluate PVD even though many patients with benign prostate hyperplasia(BPH)complained the PVD clinically.This study is to assess the correlation between PVD & ED in men with LUTS.Methods: From October 2014 to February 2015,one hundred twelve patients were enrolled.All patients were more than 40 years.Patients filled in intemational prostate symptom score(IPSS)and Hayllm PMD questionnaire(HPMDQ)that was made by authors.Prostate size via TRUS,PSA,uroflowmetry including Qmax & PVR,IPSS,IIEF-5 were checked.Results: Patients were classified as ED and non ED groups.Mean age were 65.2(ED 62.8,non ED 63.8),mean prostate size 40.1 mL(ED 38.5 mL,non ED 38.8 mL),mean IPSS 13.9(ED 11.6,non ED 14.4).Average HPVDQ score for non ED and group were 0.6,1.3 respectively(P<0.05).Erectile function(IIEF-5)was inversely well correlated with PVD(r=-0.338,P<0.05).Prevalence of ED was related to PVD severity(P<0.05).Predictive accuracy of PVD for ED was not superior to that of other LUTS.Incorporation of PVD into IPSS increased predictive accuracy of LUTS for ED(P<0.05).Conclusions: The PVD in men with LUTS showed high prevalence and significant inverse correlation with ED.