The　vertical-cavity　surface-emitting　laser　(VCSEL)　is　treated　as　multilayer　optical　thin-film　composed　of　a　stack　of　semiconductor　materials,　and　its　optical　properties　can　be　designed　using　the　optical　thin-film　theory.　The　influence　of　the　device　structure　on　the　distributed　Bragg　reflector　(DBR)　reflectivity　and　the　cavity　mode　reflectivity　is　calculated　and　analyzed.　Further,　the　standing　wave　distribution　in　the　entire　device　was　calculated　using　the　Fresnel　matrix　method　of　optical　thin　film.　From　the　results　of　calculation,　it　shows　that　studying　and　design　the　vertical-cavity　surface-emitting　lasers　optical　properties　as　the　optical　thin-film　is　a　simple　way.