Abstract: In order to research and evaluate the impact properties of resistance spot-welded joints, a pendulum impact to test machine and fixtures was developed. And the control system, human-machine interface, data acquisition system and data processing algorithm were also developed based on the Labview software and high speed data acquisition card. All the above hardware equipment and software constitute an integrated system for the performance testing of spot-welded joints. With the testing machine, the impact properties of DP980 specimens welded with different currents were measured. Based on the measured data, the consistency of the impact forces, maximum swing angles and total absorbed energies measured and calculated with several different methods were compared and analyzed in detail. It is concluded that the measured impact force is reliable, the data processing algorithm is correct, and the testing results can be used for evaluating the impact properties of spot-welded joints.