As　an　important　component　of　modern　service　industry,　tourism　is　regarded　as　a　＂green＂　driver　to　regional　economic　growth　and　industrial　upgrading.　Applying　the　＂quasi-natural　experiment＂　advocated　by　the　＂The　Belt　and　Road＂　initiative,　this　paper,　based　on　the　method　of　DID,　assessed　the　influence　of　this　initiative　on　regional　tourism　development　by　analyzing　panel　data　collected　from　286　prefecture-level　cities　in　China　over　the　period　of　2007-2018.　It　is　found　that　the　＂The　Belt　and　Road＂　initiative　has　stimulated　market　dynamics　and　promoted　tourism　development　in　the　regions　along　the　route　and　has　significantly　improved　indicators　such　as　per　capita　domestic　and　inbound　tourism　revenue　and　per　capita　domestic　and　inbound　tourist　receipt.　Also,　the　degree　of　contribution　of　domestic　tourists　to　the　tourism　economy　of　the　regions　where　the　policy　has　been　implemented　is　stronger　than　that　of　inbound　tourists.　In　sum,　the　results　of　this　paper　not　only　confirm　that　the　＂The　Belt　and　Road＂　initiative　has　significantly　contributed　to　the　high-quality　tourism　development　of　Chinese　provinces　along　the　routes　but　also　provide　important　policy　enlightenment　for　the　upgrading　of　regional　tourism　industry　and　regional　economic　balance.