In order to explore the causes of gait movement disorders in children with cerebral palsy from the level of neural control, this paper designed the surface EMG signal of 8 muscles of each lower limbs in 17 subjects during the gait process,and used the Kendall model to map the surface EMG signals,to the corresponding spinal motor neuron location. At the same time, in order to describe the changes of the activation position of the cord activation centor segments, this paper proposes the CoA curve of the central point,and calculated the number of extreme of the CoA curve. The results showed that the activation of spinal cord segments in both healthy children with cerebral palsy, it is found that there is no obvious difference in the spinal cord segments and uneven CoA curve in the gait movement of the two. The range of extreme points for healthy children is 8~34, cerebral palsy range from 50~144. The results show that the research results in this paper will help to better understand the neural control mechanism and the pathology of gait movement disorders in children with cerebral palsy, and further extend Kendall model method to the field of abnormal gait movement assessment in children with cerebral palsy.