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1. The regulatory mechanism of phonation modality in patients with mild voice disorders was studied and shown as changes of pitch : mean flow rate and intensity : mean flow rate on a cathode ray oscilloscope via phonation analyzer SK-80.<BR>2. The result was that adult patients with singers' nodules tried to vocalize by making the intensity stronger rather than by making the pitch higher, in order to lessen the excessive flow volume during vocalization.<BR>3. Infants with laryngeal nodules reduced the loss of expiratory flow by making the pitch higher rather than by making the intensity stronger.<BR>Simultaneous changes of modality were also found in patients with chronic laryngitis or mild recurrent nerve paralysis.<BR>4. We were unable to determine whether the pitch or intensity dominant states caused a vicious circle, that is whether the states themselves caused the abnormalities to worsen.