Adopting modular design and factory production, with the box as the basic unit, it can be used independently or form spacious usage space through different combinations of horizontal and vertical directions, and can be stacked vertically. The box unit structure is a standard component welded with special steel, and the boxes are connected by bolts. The structure is simple and the installation is convenient and fast. Can be used for real estate development company sales exhibition halls, product sales exhibition halls, temporary reception centers, commercial temporary offices, shops, etc.