Assembled hemispherical screen applied to unbounded projection place and projection method

The invention relates to an assembled hemispherical screen applied to an unbounded projection place and a projection method. The steel connecting discs are used as connecting nodes, so that the crossbeam arc-shaped keels and the vertical beam arc-shaped keels are movably hinged to the corresponding screw holes of the steel connecting discs through the anti-retreating screws, thereby realizing theflexible connection of the true dome screen steel skeleton, and having the anti-deformation capability; inclined strut pipe fittings are hinged to the four inclined directions of each steel connecting disc respectively and connected to the adjacent vertical beam arc-shaped keels, so that joints of the dome screen steel framework are firm; the structure has anti-deformation and flexible adjustmentfunctions, and is simple and rapid to assemble; besides, in the projection method, the projection devices at different positions are arranged at the top and the ground of the dome screen, so that thedouble-machine superpositio