The subsidy of developmental rehabilitation service (voucher) has gone unchanged for more than 10 years without consideration of rising prices or minimum wages, and thus they do not provide high quality rehabilitation services. The purpose of this study was to examine the awareness of the parents of disabled children using vouchers in regards to the use status and subsidy appropriateness of vouchers, in particular, vouchers for speech-language therapy (ST) services. Methods: A questionnaire consisted of 24 questions about the use status and subsidy appropriateness of vouchers and vouchers for ST was distributed to parents of disabled children who were currently using vouchers. Two hundred seventy-six questionnaires were collected and analyzed. Results: Eighty-five percent of the respondents answered that the current subsidy of voucher was not appropriate, with the most frequent response being that KRW 310,000-400,000 would be the appropriate amount. Most children were receiving two types of therapy using vouchers, and the most commonly used type of therapy was ST. The number of ST sessions per month using vouchers was 4 times, however the number of ST session believed to be necessary was 8 times. Seventy-four percent of the respondents said that they paid more than KRW 80,000 in addition to voucher. Conclusion: The developmental rehabilitation service voucher has been provided for the purpose of improving the functioning of disabled children and alleviating the burden of their family, however there is not enough voucher support to achieve t purpose, and it is necessary to increase the amount of voucher subsidy.