This RCT aims to investigate the effect of repetitive transcranial magnatic stimulation (rTMS) in treating children with hemiplegoc cerebral palsy. The study will measure any improvement in spasticity after using contra-lesional inhibitory rTMS follow by intensive limb training. Participants will attend a 10-day rTMS treatment sessions, follow by intensive training of the impaired limb. They will also undergo MRI scans before and after the treatment to investiagte the underlying neurophysiological mechanisms that lead to changes clinically by using TMS as well as MR-DKI. Researchers will compare the intervention group and the sham group to see if rTMS could result in improvement of participants' spasticity.