The basic process of the test is to connect the wire to the resistance on-off block of the digital multimeter, squeeze the wire harness with the selected extrusion head on the static press, connect one end of the multimeter to the press equipment, and one end of the wire harness to the inner core metal, and the multimeter beeps When the press stops loading, the test is terminated. At this time, it can be considered that the extrusion head has contacted the metal wire inside the wire harness, and the wire harness can be judged to be crushed and failed. In order to reduce the error, each group of tests was carried out 5 times, and the average value of the results was taken as the test result.