From the perspective of the combination of science and technology and virtual technology, this work uses Unreal Engine 4 to develop a set of virtual display and interaction system for the Chinese manned submersible "Jiaolong", which combines the functions of introduction, display and immersion interaction. The system shows a highly restored three-dimensional model of the "Jiaolong" and the large surface and underwater shapes of ocean islands made by the unreal engine. Users can view the functional introduction of each part of the "Jiaolong" from a third perspective, experience the diving process of the "Jiaolong", and personally operate the "Jiaolong" to dive into a trench thousands of meters deep.