By　noting　the　fact　that　the　intrinsic　growth　rate　are　not　positive　everywhere,　we　revisit　Lotka-Volterra　competitive　system　with　the　effect　of　toxic　substances　and　feedback　controls.　The　corresponding　results　about　permanence　and　extinction　for　the　species　given　in　(Chen　and　Chen　in　Int.　J.　Biomath.　8(1):1550012,　2015)　are　extended.　Furthermore,　a　very　important　fact　is　found　in　our　results,　that　is,　the　feedback　controls　and　toxic　substances　have　no　effect　on　the　permanence　and　extinction　of　species.　Moreover,　we　also　derive　sufficient　conditions　for　the　global　stability　of　positive　solutions.　Finally,　some　numerical　simulations　show　the　feasibility　of　our　main　results.　©　2017,　The　Author(s).