The main content of this project is to make the "National Home" interactive display system through UE4 software. This system covers the start interface, project introduction page, instructions for use, building introduction, building display and roaming display. The interactive display includes mouse dragging to rotate the building observation, mouse dragging to switch pictures, clicking to play details to expand animation, Q key to switch the first person to the third person, O key to play camera roaming animation, E key to open the door close to the building, P key to hide the appearance close to the building, M key to open the small map, Tab key to open the complete map, click on the name on the map to transmit, 1-6 number keys to transmit, ESC to call menu panel, F key to switch flight and walking mode, space bar to fly up in flight state, Shift key to enter dive state, add water interaction, character redirection, etc.