A toy is a valuable medium for promoting parent-child interaction. This study selected six light-emitting or reflective materials to produce composite toy balls, and conducted tests on 15 families with preschool-aged high-functioning autistic children. Quantification method I analysis was employed in the study, and the experimental results indicated that (a) the metal ball (reflective and dynamic light) was the representative sample that elicited many smiles or laughs and much finger pointing as well as high levels of pleasure and activeness; (b) the mitball (static light) was the representative sample that provoked much eye contact, produced satisfactory reactions to activities; (c) the quality of fluorescence enhanced the levels of pleasure and the reactions to the activity. This study proposes that dynamic and reflective materials can be adopted to divert the attention of children, and fluorescent toys can be employed to sustain parent-child interaction.