The　stability　and　safety　of　the　soil　slope　will　be　threatened　when　the　thrust　at　front　end　of　slope　change　due　to　rainfall　infiltration.　Rainfall　simulation　system　and　monitoring　system　are　used　to　make　a　comprehensive　and　real-time　monitoring　of　rainfall-induced　slope　failure　process　of　unsaturated　residual　soil.　The　real-time　response　of　thrust　at　front　end　of　slope　with　different　locations,　slope　angles,　densities　and　rainfall　conditions　are　analyzed.　Results　show　that　the　changing　of　water　content,　matric　suction,　body　strain　and　thrust　at　front　end　of　slope　in　the　upper　part　of　slope　is　with　great　range　and　speed,　while　the　bottom　part　of　slope　with　less　range　and　speed.　The　change　of　thrust　at　front　end　of　slope　can　be　divided　into　slow　increase,　rise　accelerate　and　attenuation　three　stages,　compared　with　less　angle　and　lower　density　slope,　the　changing　of　residual　thrust　in　larger　angle　and　higher　density　slope　is　more　strong　and　with　a　higher　peal　value.　The　new　slope　is　easier　to　fail　than　the　old　one　under　rainfall　since　a　greater　growth　force　in　a　new　slope.　The　internal　high　stresses　of　larger　angle　and　higher　density　slope　inside　can　be　fully　released　after　repeated　rain,　i.e.,　a　high　level　of　residual　slide　force　will　be　happened,　and　the　effect　of　soil　softening　will　be　even　more　significant.　The　results　are　useful　and　meaningful　for　further　revealing　the　influence　mechanism　of　unsaturated　soil　slope　under　rainfall　infiltration　in　Southeast　of　Fujian,　to　further　understand　the　weakening　effect　of　unsaturated　soil　strength　and　stability.　©　2017,　Science　Press.　All　right　reserved.