Morphing wing aircraft have attracted great interests in the past few decades because of their capability in changing wing shape according to different flight conditions for obtaining an optimum performance both aerodynamically and structurally. In this paper, a method using a singledegree-of-freedom (SDOF) mechanism which is developed based on the concept of Sarrus linkage is presented. Computational Fluid Dynamics (CFD) analysis on the aerodynamic performance of a morphing wing aircraft using this mechanism is conducted. Maximum stress within the mechanism structure is also found using Finite Element Method (FEM). Nomenclature M = mechanism mobility N = number of links (including the fixed link) j = number of joints f = degree-of-freedom of the joints l = length of links D = distance between the two parallel links α = angle between the driving link and the fixed link v = velocity of the link L, D = lift/drag force CL, CD = lift/drag coefficient