Parental explanatory models about autism influence the type of therapy a child receives, the child's well-being, and the parents' own psychological adaptation. This qualitative study explored explanatory models used by parents of children with autism. In-depth interviews were conducted with 13 parents of children with autism from a medical center in Taiwan. Despite high educational background, most of these parents attributed their child's autism to both biomedical and supernatural etiologies without apparent conflicts. These parents chose a wide variety of treatment strategies, including biomedical and alternative treatments, which often created time/energy pressures and financial burden, and were influenced by parents' cause attribution. Parents' illness explanations influence their treatment selections and need to be understood and accepted by health care providers.