Purpose:To evaluate the efficacy and safety of radial extracorporeal shock wave therapy (rESWT) according to total number of pulses on hamstring muscle spasticity in children with spastic type cerebral palsy (CP)．Methods:This study is a randomized controlled trial consisting of thirteen patients with spastic CP, 9 males and 4 females, aged 5 to 14 years (mean age 9.2). Twenty-five spastic hamstring muscles were divided in four groups. Group I: 500 pulses, Group II: 1，000 pulses, Group III: 1，500 pulses, and Group IV: 2，000 pulses. Australian Spasticity Assessment Scale (ASAS) was measured at four different time points (pre-ESWT, post-ESWT, 2 weeks post-ESWT, and 4 weeks post-ESWT)．Results:All four groups showed improvement in ASAS relative to pre-treatment, although only significant in Group III (1，500 pulses). There were no statistically significant differences in ASAS between all four groups in pre-ESWT [|2(2)＝3.907, n P＝0.272], immediately post-ESWT [|2(2)＝1.250, n P＝0.741], 2 weeks post-ESWT vs pre-ESWT [|2(2)＝3.367, n P＝0.338], and 4 weeks post-ESWT vs pre-ESWT [|2(2)＝1.566, n P＝0.667]．n Conclusion:The effect of rESWT on spastic hamstring in children with spastic CP is not dependent on the number of pulses.