To　evaluate　the　green　innovation　efficiency　of　the　Yangtze　River　Economic　Belt　accurately,　this　paper　took　environmental　heterogeneity,　decision　-　making　unit　heterogeneity,　and　all　optimal　weighting　schemes　into　consideration.　We　constructed　a　double　heterogeneity　DEA　interval　cross　-　efficiency　model　and　proposed　the　concept　of　a　single　heterogeneity　DEA　interval　cross-efficiency　evaluation.　The　green　innovation　efficiency　of　95　cities　in　the　Yangtze　River　Economic　Belt　from　2013　to　2020　was　evaluated.　The　results　were　shown　as　follows:　(1)　During　the　period　of　inspection,　no　matter　whether　under　double　heterogeneity　or　single　heterogeneity,　the　Yangtze　River　Economic　Belt＇s　overall　green　innovation　efficiency　had　not　yet　reached　a　state　of　effectiveness.　If　examined　in　single　heterogeneity,　a　clear　upward　trend　and　stage　characteristics　were　shown.　(2)　In　the　event　of　double　heterogeneity,　the　green　innovation　efficiency　of　the　downstream　areas　needed　to　be　more　compatible　with　the　levels　of　urban　development.　(3)　Under　single　heterogeneity,　the　efficiency　of　green　innovation　had　a　significant　spatial　distribution,　which　displayed　that　the　downstream　areas　were　better　than　the　midstream　areas,　and　the　midstream　areas　were　better　than　the　upstream　areas.　(4)　Under　dual　heterogeneity,　the　green　innovation　efficiency　of　Suining　was　ranked　as　the　first　in　the　upstream　areas.　The　performance　of　the　green　innovation　efficiency　of　Shaoyang　was　the　best　in　the　midstream　areas.　Meanwhile,　in　the　downstream　areas,　Bozhou　had　the　best　green　innovation　efficiency.　In　the　station　of　single　heterogeneity,　Suining＇s　green　innovation　efficiency　was　the　highest.　Finally,　based　on　the　above　conclusions　as　well　as　the　Yangtze　River　Economic　Belt　＇　s　regional　locations　and　stages　of　urban　development,　certain　suggestions　were　put　forward　to　improve　the　efficiency　of　green　innovation　in　the　Yangtze　River　Economic　Belt.　©　2024　Editorial　office　of　Resources　and　Environment　in　the　Yangtze　Basin.　All　rights　reserved.