Abstract: ［Objective］ To meet the requirements of external entities for accessing video surveillance images from Shanghai rail transit system, and to ensure the normal, stable and secure transmission of these images, it is necessary to study the docking scheme between Shanghai rail transit technical security system and external systems. ［Method］ Starting from the architecture of Shanghai rail transit technical security system, the docking scheme between Shanghai rail transit technical security system and external systems is further elaborated based on an analysis of the challenges and key points for system docking, and the calling process of the docking scheme is described through specific call cases. ［Result & Conclusion］ The docking scheme between Shanghai rail transit technical security system and external systems features a simple logical architecture, clear system boundaries, and a high level of network security protection, effectively meeting the needs of external entities for accessing Shanghai rail transit surveillance images.