Abstract: It is difficult to test the high-field-intensity electromagnetic radiation effects of shielded multi-core wire coupling channel for large weapons and equipment. Thus, a theoretical model of shielded multi-core wire coupling channel with bulk current injection as an equivalent substitute for high-field-intensity electromagnetic radiation is established. The differential mode response of each wire pair of the test equipment under radiation and injection conditions is calculated. The equality of the differential mode response of each wire pair under the two conditions is taken as the equivalent basis, and it is found that, under the conditions of impedance matching at the transmitting port, the equivalent correspondence relationship between injected source and field intensity of each wire pair is linear and equal, and independent of the terminal impedance of each wire pair connection within the test end. The equivalent test method for continuous-wave high-field-intensity electromagnetic radiation effects of shielded multi-core wire coupling channel under matched conditions of equipment transmitting ports is proposed and experimentally verified. The test results show that when one set of pairs is equivalent, the remaining pairs have also achieved equivalence. Even if the impedance of the test end changes nonlinearly, the maximum error of each wire pair is less than 3 dB, which verifies the validity of the test method.