Objectives: To describe clinical and subclinical features of symptomatic benign prostatic hyperplasia, same time, survey correlation of some os urodynamic indexes with clinical and subclinical symptoms. Material and methods: 22 BPH patients with LUTS were examined in General Surgery Department in Hue University Hospital from 4/2012 to 4/2013. They were measured uroflowmetry, urodynamic indexes and the results obtained will be compared with the clinical features, IPSS score, QoL score and prostate volume, intravesical prostatic protrusion, post-void residual urine volume. Results: Qmax average 8.89 + or - 6.03ml/s, Qmax 10ml/s dominated (77.3 percent), but when evaluate by measurement uroynamic, only 62.5 percent is real obstruction. Group of patients with bladder contractility function weak 42.9 percent, normal 35.7 percent and strong 21.4 percent. There are 17.65 percent patients have instability bladder. Moderate correlation between BOOI- IPSS, BOOI- prostate volume. Low correlation between BOOI-QoL, BOOI - intravesical prostatic protrusion. High correlation between BOOI and Qmax. Conclusion: urodynamic test provides important informations for assessing the situation bladder outlet obstruction due to benign prostatic hyperplasia.