Objective: To conduct a scoping review on the application status of the Functional Activity Score (FAS) in postoperative active pain management in China, providing a reference for its standardized and normative promotion. Methods: Computerized searches of Chinese and English databases were performed to collect studies published by Chinese scholars from 2005 to July 2025 on the application of FAS in postoperative active pain management. After strict screening, the basic characteristics, application fields, assessment models, evaluation timing, types of functional activities, and clinical outcomes of the included literature were systematically analyzed. Results: A total of 18 studies were included, involving surgical types such as thoracic surgery, general surgery, and orthopedics. All studies adopted FAS combined with the Numeric Rating Scale (NRS) for assessment, with evaluation timing mostly concentrated within 72 hours postoperatively. The selected functional activities primarily included respiration-related and limb movements. Evaluation indicators covered pain control, functional recovery, complications, adverse events, patient experience, and tool assessment, with most studies reporting positive outcomes. Conclusion: FAS can effectively enhance pain control and promote functional recovery in postoperative active pain management in China, demonstrating high clinical value. However, existing studies exhibit inconsistencies in assessment criteria, selection of activity types, and research quality.