W-I computerized posturography system, designed by authors of this article, was introduced. Using this system body sway was measured in 60 normal adults and 484 patients with vertigo. 204 patients with confirmed clinical diagnoses were analyzed. Posturography (PSG) may be classified in 16 composite graphic types. Statistics suggested that PSG of 84.5% patients with unilateral peripheral vestibular dysfunction show that the left-right direction graphic type and of 77.8% patients with front-back direction graphic type. The mechanism of the above-mentioned types of posturography was discussed.