Study about the forming of foam trays from potato starch by the additive to enhance the strength of the foam trays. Addition agent into is the corn fiber and polyvinyl alcohol. Results in study on additional fiber corn growing to make foam trays starch the tensile resistance and flexibility of the foam tray decrease But the addition of polyvinyl alcohol will increase the resistance. reduces the water absorption of foam tray flour foam tray flour makes the dough is strong and water resistance to better.