The purpose of this study was to investigate the parent involvement in individualized education program (IEP) of students with hearing impairments at elementary school level. Parents having children with hearing impairments at elementary school level lived in Taipei City / County were subjects of this study. A self-developed questionnaire,” Questionnaire of Parent Involvement in Individualized Education Program of Students with Hearing Impairments at Elementary School Level,” was used to collect data. 422 copies of the questionnaires were sent out, 260 copies returned (return rate was 61.6%) and 248 copies were valid, the effective return rate was 58.8%. The major findings were as follow: 1. Parents’ knowledge on IEP was between partial understanding and most understanding. About 23% parents were fully understanding; 26% parents were most understanding;29% parents were partial understanding;21% parents were not understanding. 2. About 56.5% of parents have ever involved in IEP development in the past 2 years. Parents’ experience of developing IEP tends to meet regulatory requirements. About 36% parents were totally agreement; 29% parents were most agreement; 24% parents were partial agreement; 10% parents were not agreement. 3.There were significant differences between parents’ knowledge on IEP among children’s educational placements;as well as parents’ experiences of involvements. 4. There were no significant differences between parents’ knowledge on IEP among their gender、educational background、their children’s grade、children’s degree of hearing loss. 5. Parents’ experiences of involving IEP were no significant difference among gender, education background, children’s grade, children’s degree of hearing loss, and children’s educational placement.