Abstract: In this paper the generalized conforming triangle element is introduced to analyze the large deflection of elastic thin plate. Based on the displacement function of generalized conforming triangle element TGC-9, the geometrically nonlinear formulation of the element is Presented. The numerical analysis of clamped and simple supported square plate, clamped circular plate and elliptical plate Proves that the geometrically nonlinear generalized conforming element has the character of simple formulation, accuracy and convergence.