To　study　the　relationship　between　matrix　suction　and　conductivity　in　unsaturated　granite　residual　soil　and　realize　the　matrix　suction　prediction　of　soil　slope　based　on　conductivity,　laboratory　and　field　tests　are　carried　out　on　undisturbed　soil　at　different　depths　of　the　Yandou　village　landslide　in　Sanming　City,　Fujian　Province,　China.　Through　physical　and　chemical　property　analysis,　soil-water　characteristic　curves　and　electric　parameter　matrix　suction　prediction　models　for　unsaturated　granite　residual　soil　at　different　depths　of　the　target　area　are　obtained.　Based　on　the　proposed　model,　the　matrix　suction　distribution　of　on-site　soil　slope　is　predicted　and　the　dynamic　response　law　under　the　influence　of　artificial　rainfall　is　studied.　The　results　show　that:　(1)　The　transverse　conductivity,　average　structure　factor,　average　shape　factor,　and　anisotropy　coefficient　of　unsaturated　soil　are　related　to　the　soil　saturation　degree.　By　considering　the　above　parameters,　the　comprehensive　structure　parameter　R-e　is　introduced　and　its　functional　relationship　with　matrix　suction　is　established.　(2)　Under　artificial　simulated　rainfall,　the　saturation,　hysteresis　of　the　conductivity　parameters,　and　matrix　suction　response　of　the　slope　occurs,　which　is　controlled　by　soil　depth,　permeability　and　rainfall　intensity.　The　matrix　suction　is　distributed　in　layers　on　the　profile　and　its　recovery　rate　is　slower　than　saturation.　The　suction　contour　map　shows　a　parabola　shape　with　the　opening　downward.　(3)　The　relationship　between　the　conductivity　parameters　of　the　residual　soil　slope　and　matrix　suction　is　further　revealed　and　a　new　method　to　indirectly　measure　matrix　suction　is　proposed.　Its　feasibility　is　verified　based　on　field　tests,　which　is　of　great　significance　to　landslide　monitoring　and　early　warning.