Autistic children sometimes exhibit extraordinary drawing ability in their earl childhood. They are usually thought to be impaired in conceptualizing visual stimuli. We participated in day-care nursery programs of two such autistic children. Their developmental process of drawing devices was compared with that of normal children and their drawing devices were analysed from the figure and the composition of the drawings. The main results were as follows: (1) their developmental process of drawing devices skipped over the stage of intellectual realism and reached a stage of perspective drawing as early as 5 ; (2) they used “intellectual-realism-drawing-devices” only when human-figures were depicted. These results suggested that intellectual realism was an effective term when explaining the specificity of normal children's drawings, and th at the drawing devices of normal children were acquired through the function of conception formed by practical activities.