Numerous waveform data, which continuously vary owing to excitation by the large-volume, airgun active source in Qilian Mountains, Gansu Province and are recorded by the Gansu and Qinghai digital seismic network, are stacked in this study. The results reveal that after single excitation, the airgun source signals could be detected by the GLT station located 304 km away from the source; the signals stacked 110 times could be detected by the AXX station located 412 km away from the source; and the signals stacked 4,600 times could be detected by the WTM station located 677 km away from the source. The findings of this study are of great scientific importance for improving the monitoring capability of the large-volume, airgun active source observation system in Qilian Mountains, extracting weak signals, and discussing the velocity change of internal medium in Qilian Mountains.