The purpose of this study were to determine the proper measurements for hip deformity in spastic cerebral palsy patients, and the correlation of hip deformity with neurological involvement and ability of ambulation. Thirty children with cerebral palsy (22 males, 8 females) were evaluated by measurements of the migration index, acetabular index, center edge angle from bilateral hip APs(Anterior Posterior view). And adductor muscle tone were evaluated by adductor tone rating scale and modified ashworth scale. The results were as follows; The incidence of hip dislocation, among the thirty children fifteen children were found to be dislocated, and more significantly high in non-walking group than in walking group (p<0.05) and in quadriplegia than in diplegia (p<0.05). Dislocation for the severe spasticity was significantly higher than for mild spasticity(p<0.05). When compared normal hip with dislocation hip, the migration index was significantly higher (p<0.01) and the center edge angle was lower in the dislocation hip than in the normal hip. Correlation of radiological findings in right and left hip, the migration index and the center edge angle were highly correlated (p<0.01). Therefore, it is recommended to evaluate the hip of cerebral palsy with radiological as well as physical examination in early childhood.