The purpose of this study was to find the effect of Day Hospital Rehabilitation programs on gross motor function in children with cerebral palsy. The subjects were 57 children with spastic cerebral palsy with no previous botulinum toxin injection or operation history within 6 months. The Gross Motor Function Measure(GMFM) score and Gross Motor Function Classification System(GMFCS) were used to evaluate as functional change and functional level. The Programs for Day Hospital Rehabilitation period for cerebral palsy children was 8 weeks. The results of the study are as follows: 1, GMFM Score of pre- and post-programs for Day Hospital Rehabilitation showed the statistically significant difference(p <.001). 2, The age group in 1-2 was higher than age 5-6 group, 3-4 was higher than age 5-6 group by Post-hoc analysis. Lastly, there was significantly different of GMFM in GMFCS level(p<.05), especially mild(GMFCS level I) and moderate(GMFCS level II, III) of CP showed that gross motor function was significantly different than severe(GMFCS level IV, V). The programs for Day Hospital Rehabilitation was effective on gross motor function for children with cerebral palsy, and for early intervention needs to mild, moderate CP, and below age 4 group.