This　Letter,　for　the　first　time,　proves　that　a　general　invariant　velocity　is　originated　from　principle　of　special　relativity,　namely,　discovers　origin　of　the　general　invariant　velocity.　When　the　general　invariant　velocity　is　taken　as　light　velocity　in　current　theories,　we　get　the　corresponding　special　theory　of　relativity.　Further,　this　Letter　deduces　triple　special　theories　of　relativity　in　cosmology,　and　cancels　the　invariant　presumption　of　light　velocity.　When　a　kind　of　matter　with　the　maximally　invariant　velocity　that　may　be　superluminal　or　equal　to　light　velocity　is　determined　by　experiments,　then　utilizing　this　Letter＇s　theory,　all　results　of　current　physical　theories　are　consistent.　(c)　2012　Elsevier　B.V.　All　rights　reserved.