Objective： The effect of COVID-19 infections on detrusor contractility in patients with benign prostatic hyperplasia (BPH) was investigated using ultrasonography video urodynamics studies (SVUDS). Methods：The clinical dataset, including general condition, inflammatory indexs, and SVUDS parameters, of 124 BPH patients with or without COVID-19 infection admitted to the Second Affiliated Hospital of Guilin Medical University and Shaoyang Central Hospital between Jan 2023 and June 2023 were retrospectively reviewed. Those patients were divided into COVID-19(+) and COVID-19(-) group according to the results of COVID-19 nucleic acid detection and clinical data over mentioned were compared between two groups. The correlation between inflammatory indexs and non-invasive SVUDS parameters and detrusor contractility in BPH patients of COVID-19(+) group were analyzed. Results：The serum level of CRP and IL-6 of BPH patients in COVID-19 (+) group were significantly higher than that of COVID-19 (-) group, whereas no significant differences in age, IL-1β, PSA, fPSA, fPSA/PSA, PV, PSAD, IPP, Qmax, URA, BOOI, footpoint, and curvature were found between two groups. Significant thicker BWT, larger PVR，and lower value of detrusor contractility indexs, including Pdet.max, Pdet.Qmax, BCI, and WF?max, were discerned in BPH patients of COVID (+) group compared to that of COVID (-) group. The negative correlation between BWT and WF?max, PVR and BCI, and PVR and WF?max was found in BPH patients of COVID-19 (+) group. Conclusions：COVID-19 might aggravate detrusor underactivity (DU) in BPH patients, resulting to increased PVR even urinary retention, which may be one urodynamic features of long-COVID in those patients.