This paper introduces LiDAR-RT, a framework for real-time LiDAR re-simulation in dynamic driving scenarios.LiDAR-RT overcomes the limitations of previous methods by using Gaussian primitives and hardware-accelerated ray tracing technology.The framework models the physical properties of LiDAR sensors using Gaussian primitives and incorporates scene graphs to handle scene dynamics.LiDAR-RT outperforms existing methods in terms of rendering quality and efficiency.