The law of pressure transfer in soil during compaction reflects the effect of compaction energy. Through a series of laboratory compaction tests in door, the curves of soil bottom pressure changing with compaction time, compaction energy, number of soil layers and water content were obtained by using the independently developed soil bottom pressure testing system, so as to reveal the law of development of soil bottom pressure under different compaction conditions. The results show that the change of soil bottom pressure with compaction time directly relates to the state of soil's loose ness or denseness. During compaction, soil absorbs the energy of compaction hammer and becomes densified, which improves the transmission effect of soil medium. The higher the compactness is, the more stable the medium is. When the soil reaches the maximum dry density under the corresponding conditions, the soil bottom pressure is the largest and the compaction time is the shortest. Under identical compaction energy, the bottom pressure decreases with the increase of layer thickness. When a stable medium is formed, the soil hardly absorbs energy anymore, and the bottom pressure tends to be unchanged. The water content has a significant influence on the compaction energy transfer effect, and the bottom pressure shows a steep drop, and the effect of compaction energy transfer is greatly reduced on the wet side of the optimal water content. Therefore, the influence of the above factors on energy transfer should be comprehensively considered in the compaction process.