To establish and compare the relationship between standing balance and walking performance, eight children with spastic diplegic cerebral palsy (CP) and 16 non-disabled, age- and sex-matched children were studied. The results showed that the children with CP had worse static balance stability in various sensory environments and dynamic balance (rhythmic shifting ability) than the non-disabled children. Moreover, the children with CP walked at a slower speed but at a greater physiological cost than the non-disabled children. In the children with CP, dynamic balance significantly correlated with walking function. It is suggested that rhythmic weight-shift training should be encouraged to improve the walking performance of children with CP.