In　this　paper,　nilpotent　subsemigroups　in　the　matrix　semigroup　over　a　commutative　antiring　are　discussed.　Some　basic　properties　and　characterizations　for　the　nilpotent　subsemigroups　are　given,　and　some　equivalent　conditions　for　the　matrix　semigroup　over　a　commutative　antiring　to　have　a　maximal　nilpotent　subsemigroup　are　obtained.　Also,　the　maximal　nilpotent　subsemigroups　in　the　matrix　semigroup　are　described.　(C)　2011　Elsevier　Inc.　All　rights　reserved.