Abstract: In the process of tensile test, different specimen connection modes would affect the overall stiffness of the test system, the strain rate in the continuous yield stage would exceed the allowable error range specified in the standard, and the test data would also be affected. By using the method of comparative test, the displacement rate of the beam could be effectively corrected, and the influence of the stiffness of the testing machine on the tensile test could be eliminated. The results could improve the working efficiency of the tensile testing machine.