Spartina　alterniflora　as　an　alien　invasive　plant,poses　a　serious　threat　to　the　ecological　functions　of　the　coastal　wetland　of　the　Jiaozhou　Bay.As　of　2019,the　distribution　area　of　S.alterniflora　in　the　Jiaozhou　Bay　has　reached　more　than　500　hm2.For　this　reason,combined　with　field　surveys,remote　sensing　monitoring　of　the　invasion　S.alterniflora　in　the　Jiaozhou　Bay　has　been　carried　out.To　accurately　identify　S.alterniflora　within　the　Jiaozhou　Bay　coastal　wetland,we　used　a　new　method　which　is　an　implement　of　deep　convolutional　neural　network,and　by　which　we　got　a　higher　accuracy　than　the　traditional　method.Based　on　distribution　of　S.alterniflora　extracted　by　the　proposed　method,the　temporal　and　spatial　distribution　characteristics　of　S.alterniflora　were　analyzed.And　then　combined　with　environmental　factors,the　invasion　mechanism　of　S.alterniflora　in　the　Jiaozhou　Bay　was　analyzed　in　detail.From　the　monitoring　results,it　can　be　seen　that　S.alterniflora　in　Jiaozhou　Bay　is　mainly　distributed　in　the　beaches　near　the　Yanghe　River　Estuary　and　its　southern　side,the　Dagu　River　Estuary　and　the　Nügukou.Spartina　alterniflora　first　broke　out　near　the　Yanghe　River　Estuary　and　gradually　spread　to　the　tidal　flats　near　the　Nügukou.The　Dagu　River　Estuary　is　dominated　by　S.anglica,whose　area　has　not　changed　much　over　the　years,and　a　small　amount　of　S.alterniflora　has　invaded　later.