Abstract: AP1000 passive PWR steam generator and main pump is connected by welding, and these welds require in-service inspection. This paper focus on the 3D motion simulation route and its movement algorithm for inspection equipment, based on Open Inventor 3D engine. The developed 3D simulation system realizes the real-time simulation monitoring for the inspection equipment delivery process and working environment, and it has the important practical significance for promoting the intuitive of inspection equipment delivery process and improving the safety of inspection activities.