To　address　compatibility　issues　between　meteorological　and　hydrological　models　in　two-way　land-atmosphere　coupling，　a　highly　efficient　WRF/Grid-XAJ　two-way　coupling　system　was　constructed　based　on　the　principle　of　mass　conservation　using　soil　moisture　as　a　linkage.　Analysis　of　two　flood　events　in　the　Tunxi　catchment　revealed　the　following：the　model　weight　parameter　quantitatively　assessed　the　compatibility　of　hydro-meteorological　model　coupling；　after　precipitation　assimilation，the　two-way　coupling　system　slightly　outperformed　the　WRF　(Weather　Research　and　Forecasting)　model　in　peak　precipitation　accuracy　(error　is　within　±5%)；the　two-way　coupling　system　more　accurately　reflected　soil　moisture；both　the　two-　and　one-way　coupling　systems　underestimated　the　hydrographs　before　precipitation　assimilation；after　assimilation，their　simulation　results　improved　and　closely　matched　those　of　the　Grid-XAJ　model　(all　Nash-Sutcliffe　efficiency　coefficients　ENS　＞　0.85)，with　the　two-way　coupling　system　showing　the　best　peak　flood　simulation　results　(error　is　within　±11%).　This　demonstrates　that　the　WRF/Grid-XAJ　two-way　coupling　system　has　the　potential　to　promote　the　simulation　and　forecasting　of　rainstorms　and　floods，offering　a　new　perspective　for　two-way　feedback　modeling　between　hydrological　and　meteorological　models.　©　2024　International　Research　and　Training　Center　on　Erosion　and　Sedimentation　and　China　Water　and　Power　Press.　All　rights　reserved.