Residual stress of front and rear glass substrates and remained pore in sealed areas of AC-PDP panel were measured to see the trend of the characteristics of sealed area as the panel size of PDP increased. For this, we compared these characteristics of 6", 42" and 80" panels, between the corner side & straight line, the vertical & horizontal sides, and the around area of ventilation port & area far from that each. Residual stress was measured by the automatic stress meter and the remained pore was analyzed by non destructive X-ray detector and optical microscope. As a result, we showed the trend of sealed area characteristics according to the magnification of PDP panel.