Whereas　the　traditional　forest　fire　spread　model　cannot　clearly　and　dynamically　display　the　fire　spread　process,　this　paper　optimizes　the　cell　structure　and　evolution　rules　of　cellular　automata　(CA)　in　the　traditional　forest　fire　spread　model　to　improve　the　simulation　accuracy　and　develops　a　forest　fire　spread　simulation　system　using　Unity　3D　technology,　which　realizes　the　dynamically　display　and　3D　visualization　of　forest　fire　spread　process.　It　plays　an　important　role　in　forest　fire　prevention　and　extinguishing.　©　2023　IEEE.