Abstract: To meet the requirements of fluid mechanics experiment in the process of teaching mode transition from offline to online education, a virtual simulation experiment platform is designed under the environment of Unity 3D. With the help of input and output, animation simulation, human-computer interaction and other technical methods, the system demonstrates the features of fluid mechanics and its engineering applications in an imaginative way. A deep experimental teaching system integrating virtual and real, online and offline resources was built and used in practice. Teaching practice indicates that this project expands the learning space and methods of students, provides a scene and interactive teaching mode, which is of benefit to the cultivation of talents in energy and power engineering major.