To　investigate　the　stability　of　unsaturated　soil　slopes　under　rainfall　conditions　with　vegetation　roots,　this　study　is　based　on　a　rainfall　infiltration　analytical　model　that　can　calculate　the　distribution　and　variation　of　pore　water　pressure　at　any　depth　of　the　soil　layer　at　any　time.　Through　theoretical　analysis,　the　effects　of　rainfall　infiltration,　tensile　strength　of　vegetation　roots,　root　area　ratio,　and　growth　direction　of　roots　on　the　stability　of　shallow　slope　sliding　were　studied.　The　results　indicate　that　the　greater　the　tensile　strength　of　the　plant　roots　or　the　larger　the　root　area　ratio,　the　stronger　the　slope　stability.　Meanwhile,　as　the　slope　angle　increased,　the　reinforcing　effect　of　vegetation　on　the　slope　stability　becomes　more　apparent.　In　addition,　the　growth　direction　of　vegetation　roots　also　has　a　significant　impact　on　the　reinforcement　effect.　In　practical　engineering,　it　is　recommended　to　select　vegetation　with　well-developed　roots,　longer　growth,　and　a　larger　root　area　ratio　while　controlling　the　growth　direction　of　vegetation　roots　to　achieve　a　better　slope　protection　effect.　©　2024　Beijing　University　of　Technology.　All　rights　reserved.