The Aim of this study was focused on efficacy of percutaneous posterior tibial nerve stimulation (PTNS) for the treatment of the overactive bladder and evaluation of Urodynamic parameter after treatment.Materials and methods The study(prospective study) includes 20 children who are complaining from overactive bladder symptoms( frequency, urgency, nocturia and urge incontinence) with no underling neurological deficit ,selected from Abo Alresh hospital. We used weekly PTNS for 12 weeks.A needle electrode is inserted into the ankle and the lead wire is connected to the stimulator. A surface electrode is then placed in the medial aspect of the calcaneus on the same leg. The amplitude is slowly increased until the patient has a response, generally a toe flex or fan. The cycle last for 30 minutes. Then the children were evaluated after3 months by bladder diary and Urodynamic test.Results:60% of the patients with complaints of OAB symptoms reported a statistically significant subjective success. Also patients showed improvement of frequency 12 out of 20 (60%), and urgency 11 out of 20 (55%), nocturnal enuresis 10 out of 16 (63%) and urge incontinence 8 out of 15 (53%) and improvement of Urodynamic parameters include detrusor over activity 14 out of 20 (70%), mean bladder capacity increasesignificantly from184.5 ± 59.14 to259.5 ± 77.22 (p=0.000) and insignificant improvement of bladder compliance 5 out of 18 (30%).Conclusions: Posterior tibial nerve stimulation (PTNS) is an effective, minimally invasive option for the treatment of patients complaining of overactive bladder with an easily accessible stimulation site.