In　order　to　study　the　soils　SWCC　transition　zone　features　under　different　steady-state　and　transient　conditions,　a　series　of　pressure　plate　and　model　tests　were　carried　out;　the　internal　structure　adjustment　of　soil　caused　by　different　test　conditions　is　the　underlying　reason　for　the　change　in　SWCC　transition　zone　curve.　Results　show　that　the　slope　of　the　SWCC　transition　zone　decreases　with　the　reduction　in　the　applied　vertical　stress　and　the　number　of　drying–wetting　cycles　during　the　pressure　plate　test;　for　the　model　test,　the　change　in　SWCC　transition　zone　of　high　compaction　degrees　and　steep　slope　soil　under　the　same　condition　is　obviously　smaller　than　that　of　low　compaction　degrees　and　gentle　slope　soil,　that　is,　the　slope　of　the　former　SWCC　transition　zone　is　obviously　slower　than　the　latter.　Also,　the　soil　parameters　a　and　b　which　represented　the　intercept　and　slope　of　the　fitting　line　in　the　plane　log(θ)　−　log(φ)　have　a　strong　linear　relationship,　implying　all　the　models　and　natural　soils　are　of　similar　grading,　and　these　transition　zone　features　do　not　alter　with　test　conditions　changing.　The　above　research　will　be　useful　and　meaningful　as　reference　for　the　engineering　characteristics　and　governance　of　the　residual　slope.　©　2019,　Indian　Geotechnical　Society.