Abstract: Objective To explore the value of urodynamics（UDS）in the diagnosis of chronic prostatitis/chronic pelvic pain syndrome（CP/CPPS）. Methods We retrospectively analyzed the urodynamic data of 204 patients diagnosed as CP/CPPS from January 2015 to April 2019.The results of urodynamic examination were analyzed，including free uroflowmetry，filling cystometry，and pressure-flow study. Results A total of 204 men were included.The mean Qmax was（14.3±6.4）ml/s，ranging 3.8 to 62.5 ml/s.The mean voided volume（Vv）was（339.6±126.3）ml，ranging 91.2 to 801.2 ml.Vv＜300ml was found in 80 cases（39.2%），and Vv＞500ml in 23（11.3%）.The flow rate curve pattern of normal bell-shape demonstrated in 92 cases（45.1%），low flat curve pattern in 96（47.1%），wavy curve in 16（7.8%），post void residual（PVR）＞50ml in 13（6.4%）.Urodynamic studies demonstrated increased sensation of bladder in 61 of cases（29.9%），detrusor over-activity in 26（12.7%），small cystometric capacity in 24（11.8%），weak detrusor in 130（63.7%），acontractile detrusor 6（2.9%），bladder outlet obstruction in 14（6.9%），and normal UDS in 44（21.6%）. Conclusions UDS examination can identify specific types of lower urinary tract dysfunction in patients with CP / CPPS，and then take targeted treatment.

Key words: chronic prostatitis, chronic pelvic pain syndrome, urodynamic