In view of the problems that the mapping relationship between the physical mechanism and the compaction state of the soil is not fully established in the existing compaction quality detection indicators, some detection indicators have low accuracy, it is difficult to accurately reflect the compaction quality, and they are easily disturbed by the construction environment, the authors have constructed an original compaction quality detection method based on acoustic theory, continuum mechanics and soil dynamics, and proposed a new compaction quality detection index, namely contact-type sound compaction value ( \(CSCV\) ), to directly characterize the compaction state of gravel soil and weathered slate.