A 27 year old man who had nasal and oral cavity closure disfunction is reported. The patient had some degree of the mental retardation which caused speech disturbance. In this report, the treatment history of the patient and the psychological evaluation are described. The results are summarized as follows: (1) The disfunction of the closure between the nasal and oral cavity should be treated by the speech aid as the first step. (2) The improvement of the speech can not always improve the mental condition. (3) The disturbance of the human relationship due to the speech disorder tends to break down the patient's identity problems. (4) Speech should be treated as soon as possible in such cases, because these disorders may cause more complex human relationship problems.

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