Abstract: This article describes the process of the shear spring，established flip-flop screen simplified mechanical model, get the formulas for the shear spring stiffness through the solution of the equations. The stress cloud and stress-strain curves under compressive conditions and shear conditions are obtained by numerical simulation. Spring stiffness and shear stiffness of shear compression is determined by universal tester, the influence of compression amount to shear stiffness is analyzed, provides theoretical basis for shear spring design calculations, selection and testing in future.