Considering　the　shortcomings　of　traditional　tunnel　support　methods　like　shotcrete,　including　large　rebound,　poor　water　retention,　and　dust　pollution,　this　paper　proposes　an　innovative　method　to　use　mold-bag　concrete　(MBC)　for　initial　tunnel　support.　Through　macroscopic　mechanical　tests　and　microscopic　structural　characterization,　a　high-fluidity　mix　ratio　of　MBC　suitable　for　actual　construction　conditions　has　been　developed.　To　clarify　the　mechanical　properties　of　MBC,　compressive　tests　were　conducted,　leading　to　important　conclusions:　1)　Moldbags　can　significantly　enhance　the　compressive　strength　and　ductility　of　MBC.　The　specimens　of　mold-bag　concrete　of　PP　(MBC-PP)　fail　first　but　have　good　ductility,　while　specimens　of　mold-bag　concrete　of　SNG-PET　(MBC-SPET)　have　the　best　compressive　performance　but　poor　ductility;　2)　Without　pressurized　drainage,　mold-bags　can　increase　the　compressive　strength　of　MBC　due　to　the　water　permeability　characteristics,　with　MBC-SPET　having　the　largest　increase　in　compressive　strength,　69.1　%;　3)　MBC-SPET　tests　show　that　increasing　pressure　has　a　better　effect　than　increasing　drainage　time,　with　90　s　and　20　kg　pressurized　drainage　being　the　best　increase　effect.　These　findings　highlight　the　potential　of　MBC　in　addressing　the　limitations　of　traditional　methods,　providing　strength　enhancement,　environmental　benefits,　and　practical　feasibility　for　tunnel　support.