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SymF-barES-FEM-T4 is proposed in order to ensure the stability of F-barES-FEM-T4 in dynamic analysis.This formulation aims to symmetrize stiffness matrix of F-barES-FEM-T4 so as to remove unstable deformation modes.The modification for stabilization is restricted to the internal force vector and does not cause increase of degrees of freedom (DOF).An example of analysis reveals that SymF-barES-FEM-T4 can show the comparable deformed shapes and acceptable pressure distributions without energy divergence, which cannot be realized by F-barES-FEM-T4.It also reveals that increase of the number of cyclic smoothings for SymF-barES-FEM-T4 does not always improve the pressure distributions no longer unlike F-barES-FEM-T4.