The linguistic competence of children develops gradually as age. Many clinician have evaluated the basic linguistic competence of children through the repetition of sentences with varying structure. The purpose of this study is to compare their performance with 20 children with cochlear implants and 15 children with hearing aids and 10 children with normal hearing between 1st and 3rd year of elementary school. The sentence repetition performance of the subjects were analyzed based on the sentence length (5 word sentences, 6 word sentences, 7 word sentences, and 8 word sentences) and sentence structure (16 of complex sentences and 16 of compound sentences). The children were asked to listen to and repeat the sentences spoken by a clinician. The results of this study indicated that the sentence length influenced sentence repetition performance of children with cochlear implants and hearing aids. Therefore, in the case of auditory rehabilitation of hearing impairments, it is necessary to pay attention to length of sentence rather than sentence structure.