Deformation　monitoring　data　provide　a　direct　representation　of　the　structural　behavior　of　reservoir　bank　rock　slopes,　and　accurate　deformation　prediction　is　pivotal　for　slope　safety　monitoring　and　disaster　warning.　Among　various　deformation　prediction　models,　hybrid　models　that　integrate　field　monitoring　data　and　numerical　simulations　stand　out　due　to　their　well-defined　physical　and　mechanical　concepts,　and　their　ability　to　make　effective　predictions　with　limited　monitoring　data.　The　predictive　accuracy　of　hybrid　models　is　closely　tied　to　the　precise　determination　of　rock　mass　mechanical　parameters　in　structural　numerical　simulations.　However,　rock　masses　in　rock　slopes　are　characterized　by　intersecting　geological　structural　planes,　resulting　in　reduced　strength　and　the　creation　of　multiple　fracture　flow　channels.　These　factors　contribute　to　the　heterogeneous,　anisotropic,　and　size-dependent　properties　of　the　macroscopic　deformation　parameters　of　the　rock　mass,　influenced　by　the　coupling　of　seepage　and　stress.　To　improve　the　predictive　accuracy　of　the　hybrid　model,　this　study　introduces　the　theory　of　equivalent　continuous　media.　It　proposes　a　method　for　determining　the　equivalent　deformation　parameters　of　fractured　rock　mass　considering　the　coupling　of　seepage　and　stress.　This　method,　based　on　a　discrete　fracture　network　(DFN)　model,　is　integrated　into　the　hybrid　prediction　model　for　rock　slope　deformation.　Engineering　case　studies　demonstrate　that　this　approach　achieves　a　high　level　of　prediction　accuracy　and　holds　significant　practical　value.　©　2024　by　the　authors.