Fascial plane block technology has developed rapidly in recent years. Unlike traditional peripheral nerve block, fascial plane block does not require to see the target nerve clearly, but only needs to understand the anatomy of the fascia to predict the effect of block. In order to clarify the anatomy of the abdominal fascial space and the circulation relationship of fluid in the thoracoabdominal fascial plane, so as to accurately grasp the diffusion of the drug solution and the level and extent of block, obtain good analgesia and avoid the occurrence of dangerous complications. This article reviews the relationship between abdominal fascial space anatomy and fluid flow and related fascial plane block techniques. Using the fascial connection relationship can expand the development range of related regional anesthesia techniques, and more anesthesiologists need to explore the fascial plane block technique and anatomical level in the future.