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The application of broadband VHF technology to the air-ground communication can effectively alleviate the problem of insufficient capacity in the current civil aviation communication. Based on the introduction to the B-VHF development and the system business architecture, it is pointed out that the overlapping coverage is the core idea in B-VHF, and the interference suppression and spectrum perception are the two key technologies to realize it. Focus on the comparative analysis between the time domain and the frequency domain processing in the radio frequency(RF) interference suppression, and between the energy test and the joint test of spectrum sensing technology, the general implementation method of the two key technologies are summarized. The prospects of the B-VHF development is prospected.