The purpose of this study was to investigate the effect of the children\'s song activities for autistic children in the acquisition of vocabulary. Children\'s song activities included listening, playing instruments, rhythmical moving, and singing. Five autistic children in the age of 4 to 6 participated in an experimental group and the other five children participated in a control group. The degree of each child\'s acquisition of vocabulary was estimated by the data from the event recording. Attention skills were estimated by minute interval recording. After 4 pre-testing sessions, the researcher carried out children\'s song activities 22 times for the experimental group, and language activities 22 times for the control group. After 4 post-testing sessions, all tests were used to observe each child\'s behavior 30 times. The results of this study were as follows. First, the efficiency in the acquisition vocabulary for autistic children increased particularly in the areas of the acquisition of receptive vocabulary and expressive vocabulary when they had been treated by the children\'s song activities compared to the language activities. Second, attention was also significantly increased for the autistic children in the experimental group who had been treated by the children\'s song activities than those in the control group who had been treated by language activities. Thus, it was concluded that the children\'s song activities could be effective method to improve the autistic children for the acquisition of vocabulary and the attention skills.