Abstract： Objective:To evaluate the postoperative long-term urination of children after surgery for hypospadias.Methods:From November 2001 to November 2013, face-to-face interviews and telephone follow-ups were conducted among hospitalized children aged under 18 years after over 5 years after hypospadias surgery. The satisfaction extent with urine function and urine flow mechanics were evaluated through questionnaires and urine dynamic tests.Results:A total of 158 children were contacted and 63 of them completed valid questionnaires while 39 received urodynamic examinations. The average age was 10.8(6-18) years. Based upon the location of urethral orifice, clinical types were distal (n=20, 31.8%), middle (n=31, 49.2%) and proximal (n=12, 19%). Based upon the position of urethral opening, they were divided into distal (n=37) and proximal (n=26) groups. During a survey on the satisfaction of voiding function, 85.7%(54/63) of them were satisfied with voiding function and 14.3%(9/63) were dissatisfied due to a weak steam, irregular lines and trickling. Through comparison, " proximal type group" had a higher proportion of dissatisfaction than that of " distal type group" (26.9%, 7/26 vs. 5.4%, 2/37, P<0.05). Based upon the severity of hypospadias, children with urine dynamic test were divided into three groups of distal type (n=20), middle type (n=31) and proximal type (n=12). For three groups, maximal urinary flow rate was (19.68±8.08) ml/s, (14.91±3.92) ml/s, (6.01±0.71) ml/s, average urine flow rate (9.58±1.56) ml/s, (8.70±0.71) ml/s, (3.85±0.64) ml/s, flow time (18.00±12.17) s, (28.29±11.60) s, (40.50±6.36) s, time to maximal flow (8.70±4.91) s, (13.50±5.53) s, (18.50±3.54) s, residual volume (6.25±4.37) ml, (10.43±6.10) ml, (15.30±1.19) ml and maximal detrusor pressure (27.50±13.03), (50.29±15.74) and (96.50±35.86) cmH 2O. And the differences between the above indices were statistically significant ( P<0.05). Conclusions:Most children have excellent voiding function after hypospadias surgery. And urodynamics may be performed as an objective index for evaluating urinary function of children.