The pattern of bioelectrical activity of the cerebral cortex of 65 children, aged 6 to 15 years, with neurosensory (35 subjects) and conductive (30 children) hypoacusis was investigated. The level of hearing impairment in the patients was different. Electroencephalographic and audiological data were processed by a computer and a statistical (predictable) model was obtained. The model describes the relationship between bioelectrical activity and hearing impairment type and level. It is found that in hypoacusis on a conductive or neurosensory EEG energy spectra and frequencies are different. It is concluded that EEG can be used for assessing the level of rehabilitation of children with marked hypoacusis.