Wrinkling deformation and its variation with the influencing factors were studied through the experiment of an annular membrane under torsion.An accurate experimental apparatus was developed to reduce the perturbation of errors resulting from boundary conditions.Pre-tensioning force was applied with weights and the home-made synchronizing equipment, and torque was exerted with the rotating platform.Wrinkling deformation was measured with the non-contacting laser displacement sensor.The research focused on the influences of boundary conditions, pre-tensioning force and thickness on the wrinkling deformation and its characteristic parameters.The results show that wrinkling amplitude increases with the torsional angle, but little change can be found in the wrinkling number and half wavelength due to the absence of secondary buckling.The increasing pre-tensioning force can reduce the wrinkling amplitude and half wavelength owing to its contribution to the membrane stiffness, but it can also induce a rise in the wrinkling number.Increase in the thickness can strengthen the bending stiffness and decrease the wrinkling number, but increase the wrinkling amplitude and half wavelength when boundary conditions and pre-tensioning force are constant.The present research reveals the effect of wrinkle-influencing factors and helps to prevent the wrinkling deformation for the surface precision of membrane structures.