We investigated the relationship among cognitive level, autistic severity and adaptive function in a Taiwanese sample of 94 high-functioning children with autism spectrum disorders (ASD) (mean full scale intelligent quotients FSIQ = 84.8). Parents and teachers both completed the Adaptive Behavior Assessment System-II and the Social Responsiveness Scale. Correlational and regression analyses were used to explore the relationships among the constructs of cognitive, symptomatic and adaptive domains. Results revealed that average General Adaptive Composites of these children (home: 74.0; school: 74.6) was below average FSIQ. Profile analysis revealed that Social domain was the weakness among the adaptive abilities assessed at school and home. Cognitive abilities had positive relationship with adaptive function, while autistic severity had a weak negative relationship with adaptive function. Also, the younger the age the child got diagnosed, the less severe the current symptoms of autism were. The implication for emphasizing adaptive skills intervention was discussed.