Based on the total Lagrangian description and large deformation variational principlewith releasing constraint conditions of inter-elements continuity,A geometric nonlinear anal-ysis of refined triangular thin bending element is newly developed.By introducing special ele-ment displaeement functions,the additional menbrance locking phenomenon is deleted effec-tively in the geometrical etiffness matrix. The numerical results show this element can deletemembrance locking and obtain solutions of high accuracy in the geometrical nonlinear analy-sis.