Integrating　the　digital　economy　into　the　real　economy　(thereafter　referred　to　as　digital-real　integration)　is　one　of　the　important　ways　to　promote　the　efficiency　improvement　of　green　development.　We　adopt　the　panel　data　of　30　provinces　and　cities　in　China　(excluding　Tibet,　Hong　Kong,　Macao,　and　Taiwan)　from　2011　to　2021　as　the　basis　of　our　study.　We　also　use　the　coupled　coordination　model　to　measure　the　level　of　digital-real　integration　in　each　region.　Then,　we　set　up　a　spatio-temporal　geographically　weighted　regression　model　to　examine　the　spatio-temporal　distribution　pattern　and　the　specific　mechanism　of　its　impact　on　the　efficiency　of　regional　green　development.　Our　study　finds　that　the　vast　majority　of　provinces　in　the　country　are　in　the　coupling　and　coordination　state　on　the　verge　of　dysfunction　and　mild　dysfunction.　Moreover,　coordinating　with　the　development　speed　of　the　digital　economy　to　reach　the　state　of　dynamic　interconnection　and　constraints　is　difficult　for　the　real　economy.　Second,　the　level　of　digital-real　integration　can　contribute　to　the　improvement　of　green　development　efficiency,　and　that　in　Xinjiang　and　Qinghai　is　lower　than　in　other　provinces.　Further　in　terms　of　spatial　distribution,　the　digital-real　integration　in　the　Yangtze　River　Delta　region　(Shanghai,　Jiangsu,　Zhejiang,　Anhui)　and　Fujian　Provinces　during　the　11-year　period　obviously　promotes　the　efficiency　of　green　development.　Finally,　through　the　mechanism　analysis,　the　digital-real　integration　development　can　be　found　to　promote　the　improvement　of　green　development　efficiency　via　three　channels:　industrial　structure　rationalization,　factor　market　development　degree,　and　government　intervention.　Findings　of　this　paper　provide　some　basis　and　reference　for　better　promoting　the　digitalreal　integration　and　then　realizing　the　long-term　sustainable　development　of　the　region.