Digital　twin　riverbasin　is　a　riverbasin　digital　twins　corresponding　to　the　physical　riverbasin　unit　object,　With　the　help　of　riverbasin　digital　twins　model,　simulation,　emulation,　verification,　prediction　and　deduction　of　the　current　physical　riverbasin　business　behavior　state　and　rule.　Aiming　at　the　problems　of　data,　algorithm　and　twin　model　in　the　construction　process　of　digital　twin　riverbasin,　The　proposed　system　Architecture　and　core　technology　of　Digital　twin　riverbasin,　the　research　on　data　acquisition,　mapping　image,　twin　model　construction　and　data-driven　technology　of　digital　twin　riverbasin　is　systematically　carried　out,　and　the　method　and　data-driven　mechanism　based　digital　thread　of　digital　twin　riverbasin　are　put　forward.　The　research　results　can　provide　theoretical,　methodological　guidance　and　technical　support　for　the　construction　of　digital　twin　riverbasin..　　©　2022　IEEE.