The　rotating　double-prism　system　allows　the　expansion　of　the　imaging　field　of　view　and　increase　of　apex　angle　of　prisms　through　beam　control,　therefore　increasing　the　magnification　of　the　field　of　view　but　aggravating　imaging　distortion.　This　paper　proposes　a　fast　distortion　correction　and　video　mosaic　method　for　large-apex-angle　double-prism　systems　to　achieve　real-time　imaging　with　a　large　field　of　view.　The　real-time　distortion　correction　and　video　mosaic　of　a　two-way　rotational　double-prism　imaging　system　are　performed　by　multiple　camera　pre-calibrations,　the　construction　of　a　table-lookup-based　interpolation　re-projection　algorithm,　and　the　application　of　a　multi-resolution　fusion　algorithm　with　image　scale　transform　based　on　the　search　for　the　optimal　seam.　For　the　expansion　of　the　field　of　view,　we　propose　an　evaluation　method　of　the　expanded　field　of　view　based　on　the　law　of　refraction　in　the　vector　form,　and　the　field　angle　expansion　factor　is　used　as　the　evaluation　index.　The　simulation　results　show　that　the　horizontal　and　vertical　field　angle　expansion　factors　of　the　mosaic　field　of　view　can　reach　1.50　and　1.30,　respectively.　The　experimental　results　verify　the　feasibility　of　the　proposed　method　and　achieve　real-time　distortion　correction　and　video　mosaic　at　30　frame/s.　©　2021,　Chinese　Lasers　Press.　All　right　reserved.