Abstract: Objective　This study aims to establish a lean management system for the whole process of day surgery based on slope theory, and to explore its application effect in improving surgical efficiency, optimizing resource allocation and improving patient satisfaction.Methods　Measures including standardized surgical procedures, information management, refined personnel scheduling, material management optimization, patient education and communication strengthening, and multi-department cooperation improvement were implemented in the day surgery center of Xuanwu Hospital, Capital Medical University.Results　After the implementation of this system, the preoperative preparation time was shortened from (85.6±12.3) min to (72.4±10.7) min (P＜0.001); The postoperative recovery time decreased from (26.3±4.5) h to (22.8±3.9) h (P＜0.001); The total hospitalization time of the patients decreased from (2.5±0.7) d to (1.9±0.5) d (P＜0.001); The patient satisfaction score increased from (82.4±6.7) points to (91.6±5.2) points (P＜0.001); The utilization rate of the operating room has been significantly improved. The intraoperative waiting time has been shortened by 32.1%, and the discharge process has been reduced by 33.7%.Conclusion　The lean management system based on slope theory is effective in the application of day surgery, which provides scientific basis and practical guidance for medical management.

Key words: slope theory, day surgery, whole process management, lean management, plan construction, progressive improvement, gynecological nursing