The purpose of Individual Education Program (abbreviate IEP) is that disabled students can accept appropriate education rights. However it can't be done by the teacher only. Parents' participation is also needed. Although internal and international laws ensure parents' rights to participate in IEP now, the findings reported that there are factors to hinder parents from participating in IEP, for example the children's disabled degree, social and economic status of parents, parents' attitude, family's support, family's pressure, self-ability, and the way and attitude of school, etc.. To the problems, the author gathered the experience of scholars and oneself, and offered the ways to promote parents participating in IEP for improving the efficiency.