We　propose　and　analyze　a　Lotka-Volterra　commensal　model　with　an　additive　Allee　effect　in　this　article.　First,　we　study　the　existence　and　local　stability　of　possible　equilibria.　Second,　the　conditions　for　the　existence　of　saddle-node　bifurcations　and　transcritical　bifurcations　are　derived　by　using　Sotomayor＇s　theorem.　Third,　we　give　sufficient　conditions　for　the　global　stability　of　the　boundary　equilibrium　and　positive　equilibrium.　Finally,　we　use　numerical　simulations　to　verify　the　above　theoretical　results.　This　study　shows　that　for　the　weak　Allee　effect　case,　the　additive　Allee　effect　has　a　negative　effect　on　the　final　density　of　both　species,　with　increasing　Allee　effect,　the　densities　of　both　species　are　decreasing.　For　the　strong　Allee　effect　case,　the　additive　Allee　effect　is　one　of　the　most　important　factors　that　leads　to　the　extinction　of　the　second　species.　The　additive　Allee　effect　leads　to　the　complex　dynamic　behaviors　of　the　system.