The　effects　of　deformation　characteristics　and　slope　instability　mechanism　on　residual　soil　slope　under　the　excavation　effect　were　investigated,　by　using　a　high　cutting　slope　of　the　Funing　(Fuding　to　Ningde)　Expressway　as　a　sample,　a　geo-mechanical　model　using　similar　materials　according　to　the　similarity　theory,　was　designed.　A　model　test　study　was　conducted,　using　a　real-time　monitoring　system　and　digital　photogrammetry　technology　on　the　multi-stage　slope　excavation　effect　based　on　PhotoInfor,　and　changes　of　displacement　and　stress　during　multi-stage　excavation　of　model　slope　were　analyzed.　The　results　show　that　the　variation　in　the　excavated　slope　is　a　gradual　process　from　slow　deformation　to　accelerated　sliding,　the　rate　of　displacement　increases　the　fastest　in　the　slope　under　the　slope　excavation　at　the　middle　and　top　positions,　the　soil　displacement　at　the　slope　top　position　is　greater　than　that　at　the　lower　part,　and　the　displacement　from　the　slope　inside　to　the　hollow　face　increases　gradually.　Further,　soil　stress-distribution　is　not　uniform　in　the　slope　excavation　process,　the　stress　concentration　at　the　foot　of　slope　is　higher,　and　the　thrust　at　the　front　end　of　slope　accelerates　gradually　during　the　excavation　process.　The　original　stress　balance　of　the　slope　is　disturbed　when　the　excavation.　A　tension　crack　formed　in　the　rear　edge　of　the　slope　and　then　the　crack　developed,　expanded,　and　connected　continuously　during　the　whole　excavation　process.　Then,　the　crack　formed　through　the　fracture　and　sliding　zone.　The　forming　process　of　the　slip　zone　is　consistent　with　that　of　the　local　strain　concentration　caused　by　stress　concentration,　release,　transfer　and　re-adjustment.　Meanwhile,　the　excavation　effect　possesses　a　certain　time-effect,　the　stress　and　displacement　change　are　not　synchronized,　and　the　strain　concentration　shows　a　certain　hysteresis,　therefore,　the　early　monitoring　of　this　kind　of　slope　should　be　considered　to　choose　the　control　index　of　the　horizontal　displacement　growth　rate.　The　stress　horizontal　growth　rate　should　be　consider　in　the　post　monitoring,　both　growth　rates　are　indispensable.　The　research　results　provide　an　important　basis　for　early　warning　monitoring　and　support　reinforcement　of　excavated　slope　in　the　southeast　coastal　area　of　China.　3　tabs,　12　figs,　25　refs.　©　2019,　Editorial　Department　of　Journal　of　Chang＇an　University　(Natural　Science　Edition).　All　right　reserved.