Abstract: In order to study the blocking effect of digital communication stations with the change of the electromagnetic pulse train repetition rate, an electromagnetic pulse injection test was performed on a digital communication station. The bit error rate (BER) of the radio stations follow the change of amplitude and repetition rate of the electromagnetic pulse train was studied. The results show that the BER of the radio station increases with the the pulse amplitude when the repetition rate is below 50 Hz. The BER no longer changes after reaching the sensitive BER. There is a linear relationship between the repetition rate of the electromagnetic pulse and the sensitive BER of the radio station. The higher the repetition rate, the higher the BER. The pulse amplitude is basically the same within the allowable experimental error when the BER reaches the sensitive BER. It can be inferred from the analysis that the blocking effect of the radio station is the accumulation of single-pulse blocking effects when the pulse repetition rate is below 414 Hz. The pulse effect time will overlap only at repetition rate over 414 Hz. And the sensitive voltage will decrease with the increases of repetition rate.