Abstract: To test the survivability of radio equipment in the environment of high-altitude electromagnetic pulse (HEMP) and reduce the uncertainty of system electromagnetic pulse vulnerability assessment, the system level nuclear electromagnetic pulse irradiation test scheme and vulnerability test assessment process are designed, and the radio electromagnetic damage assessment algorithm based on fault tree model is established. Taking the electromagnetic vulnerability assessment of SG-7200 ultra short wave radio as an example, the threat level radiation test is carried out by using the electromagnetic damage assessment algorithm in this paper. The test results show that the radio frequency hopping phenomenon and communication failure occur in the 50 kV/m radiation test; in the fault tree model, according to the test data, the failure probability of the system is 78.83% in the 50 kV/m threat level radiation test.