We have been promoting the hydrotherapy consisting of the assumption that the water exercise would help to develop the empowerment not only the sociability but also the exercise ability of the children with autism spectrum disorders (ASD). The purpose of this study was to investigate the relationship between the activity of individual support and the establishment of order to the tasks. Subjects were 13 children with ASD. We obtained informed consent with parent of participating members. We examined a five-points estimation during one year. Grade evaluation was in two stages ; can do and cannot do. The order of achivement of children with ASD was nearly consisted with the order of a healthy person both a beginner’s class and a middle class. These results suggest that the activity of individual support and the establishment of order of the tasks is practical method as the hydrotherapy.