Anatomical abnormalities and dysfunction of anti reflux barrier are important causes of gastroesophageal reflux disease. This paper proposes to use the "door system" as a metaphor for the composition of the anti reflux barrier, emphasizing that the anti reflux barrier is not a single anatomical unit, but an organic whole with multiple structures, such as the lower esophageal sphincter (door plate), diaphragm foot (door frame), phrenic esophageal ligament (hinge), his angle, gastroesophageal valve flap (door handle), which are precisely combined and coordinated with each other. The phrenic esophageal ligament connects the lower esophageal sphincter (LES) with the diaphragm foot to form a spatial structure that overlaps anatomically and functionally, namely the "coincide" structure. The his angle and gastroesophageal valve flap are the same antireflux valve complex described from different perspectives inside and outside the gastric wall. The "coincide" structure and the anti regurgitant valve complex are cross-linked to each other to play an anti regurgitant role, and they constitute the main structure of the anti regurgitant barrier. Hiatal hernia is an important anatomic etiology leading to the occurrence and development of gastroesophageal reflux disease. Esophageal hiatal hernia through the diaphragm foot expansion, diaphragmatic esophageal fascia relaxation, gastroesophageal junction upward, resulting in lower esophageal sphincter pressure drop, gastroesophageal valve flap loose, his angle blunt, resulting in the systematic destruction of the anatomical structure of the anti reflux barrier, resulting in the overall obstacle of anti reflux function. Based on this holistic perspective, the article demonstrates that the essence of anti reflux repair surgery is the precise repair of the organic complex of anti reflux barrier: repair the "coincide" structure consisting of the lower esophageal sphincter and the diaphragm foot together with the phrenic esophageal ligament, restore the length of the abdominal esophagus, and rebuild the anti reflux valve complex consisting of his angle and gastroesophageal valve flap, namely the door handle system, to achieve the restoration of anti reflux structure function integration through "four in one" reconstruction. The destroyed anti reflux barrier was reconstructed into an anti reflux organic complex with precise combination of anatomic components and functional cooperation of multiple structures.