The digital twin simulation solution establishes virtual mirrors of physical objects through high-precision modeling and real-time data mapping to achieve dynamic simulation and predictive optimization of the whole life cycle. Its core technology integrates 3D geometric modeling (based on CAD/BIM), multi-physics field simulation engine and artificial intelligence algorithms, supporting multi-disciplinary coupled analysis of mechanical structure, fluid mechanics, electromagnetic compatibility and so on. In the field of smart city, it can simulate traffic flow, building energy consumption and natural disaster emergency response.