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Objective To explore the effects of catheters of different sizes on uroflowmetry after Snodgrass surgery in children. Methods From July 2017 to June 2020, retrospective study was performed for 266 children with hypospadias undergoing initial Snodgrass surgery. According to the postoperative size of catheter, they were divided into 3 groups of Fr 6 ( n=89), Fr 8 ( n=85) and Fr 10 ( n=92). All catheters were removed at Week 2 post-operation. Uroflowmetry was examined at Month 1 post-operation (T1), Month 3 post-operation (T2), Month 6 post-operation (T3), Year 1 post-operation (T4) and Year 2 post-operation (T5). And urine flow curve, Q max (maximum flow rate) and Q ave (average flow rate) were recorded. ResultsQ max and Q ave were both the lowest among three groups at T1 and increased over time. Intragroup comparison showed Q max{Fr 6[(6. 90±2. 73), (7. 27±2. 40), (8. 62±3. 03), (9. 98±3. 08), (11. 3±3. 42) mL/s] vs. Fr 8 [(7. 19±3. 14), (7. 50±2. 88), (8. 41±2. 96), (8. 97±2. 83), (10. 82±4. 45) mL/s] vs. Fr 10 [(6. 72±2. 84), (6. 87±2. 71), (8. 28±2. 91), (9. 48±2. 83), (10. 95±3. 15) mL/s]} and Q ave{Fr 6 [(3. 99±1. 57), (4. 46±1. 67), (5. 15±1. 88), (5. 86±1. 78), (6. 47±2. 22) mL/s] vs. Fr 8 [(4. 04±1. 78), (4. 14±1. 76), (4. 96±1. 78), (5. 45±1. 91), (6. 28±2. 89) mL/s] vs. Fr 10 [(4. 04±1. 57), (4. 29±1. 70), (5. 02±1. 80), (5. 64±1. 99), (6. 84±2. 37) mL/s]} differed greatly at 5 timepoints ( P<0. 01), Multiple comparisons revealed that Q max and Q ave were significantly different between T2 and T3 ( P<0. 01), T3 and T4 ( P<0. 01) and T4 and T5 ( P<0. 01). Urine flow curve type indicated that platform curve dominated for 60%(160/266) and 55%(145/266) at T1/2 while bell curve accounted for 52%(138/266), 57%(152/266) and 64%(172/266) at T3/4/5. Ratio of urine flow curve type differed markedly at 5 timepoints ( P<0. 001), especially between T2 and T3 ( P<0. 05). Conclusions In children of hypospadias after Snodgrass surgery, postoperative uroflowmetry is not affected by catheters of different sizes. [ABSTRACT FROM AUTHOR]