In　recent　years,　the　extreme　rainfall　events　have　occurred　frequently　in　China,　and　so　investigating　the　infiltration　law　and　slope　stability　of　single-layer　soil　covers　under　heavy　rainfall　events　is　of　great　significance.　An　analytical　solution　for　rainwater　infiltration　into　single-layer　soil　covers　is　derived　based　on　the　two-dimensional　governing　equation　for　unsaturated　flows.　This　analytical　solution　is　obtained　by　employing　the　constant　flow　rate　and　constant　pore　water　pressure　head　as　the　top　boundary　conditions　of　the　cover　before　and　after　the　surface　soil　reaches　saturation　during　a　heavy　rainfall　event.　The　analytical　solution　is　validated　by　comparing　with　the　results　of　the　finite　element　software　Geostudio-Seep/W.　Based　on　the　analytical　solution　and　the　theory　of　shear　strength　of　unsaturated　soils,　the　variation　of　the　factor　of　safety　of　a　single-layer　soil　cover　under　a　heavy　rainfall　event　is　analyzed.　The　results　indicate　that　the　greater　depth　the　potential　sliding　surface,　the　slower　the　response　of　the　factor　of　safety　to　rainfall.　During　the　whole　rainfall　period,　the　factor　of　safety　with　the　bottom　surface　of　the　cover　as　the　sliding　surface　remains　the　smallest,　indicating　that　the　cover　is　most　prone　to　sliding　along　this　sliding　surface.　The　analytical　solution　obtained　in　this　study　provides　a　simple　and　practical　tool　for　evaluating　the　anti-seepage　performance　and　stability　analysis　of　single-layer　soil　covers.　©　2025　Chinese　Society　of　Civil　Engineering.　All　rights　reserved.