This project takes flying and searching for Kongming lanterns as clues, and combines the novel and interesting interactive system with the traditional roaming system to create a multi-scene and immersive virtual world. This project uses UE4 engine and 3dsMax modeling software to build a simulated exhibition hall scene and a virtual antique scene. After the modeling is completed by 3dsMax, the model is imported into UE4 to add collision bodies. After reasonable layout, plants are added for embellishment. Combined with the street scene layout of Tang Dynasty, the scene is continuously optimized. Then the roaming test of the scene makes the interaction and the scene better match and merge. The cutscene is recorded with Sequence, and then the blueprint is used to series animation and character operation, and interspersed with particle system, finally realizing scene roaming and Kongming lamp interaction. Combined with various technologies in the virtual engine, this project breaks through the boring experience mode of the traditional roaming system and reappear the magnificent ancient city.