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Airframe noise reduction becomes a main interest among researchers who study the performance of aircrafts. The airframe noise can occur between the high-lift systems and main body of the airfoil. The proposed shape-changing airfoil is one of many ideas to reduce airframe noise by eliminating the gap between the main body and the high-lift systems. This paper presents a new design of 30P30N airfoil, which converts the three-element airfoil into two-element airfoil by installing a shape-changing slat into the systems. The performances of airfoil are studied by comparing the conventional and the shape-changing 30P30N airfoils where velocity and angle of attack are constant.