The　presence　of　adherent　particles　on　the　metal　wall　during　the　impact　adhesion　process　between　trace　lubricating　oil　droplets　and　the　metal　wall　has　a　significant　impact　on　the　quality　of　lubricating　oil　film　formation　and　the　heat　dissipation　effect　of　the　friction　pair.　The　impact　process　of　oil　droplets　and　adherent　particles　on　the　inclined　wall　is　observed　and　analyzed　by　high-speed　camera　experiments.　The　aim　is　to　investigate　the　effects　that　oil　droplet　impact　velocity,　wall　inclination　angle　and　other　factors　have　on　the　morphology　evolution　and　spreading　characteristics　of　oil　droplets,　as　well　as　the　dynamic　characteristics　of　the　adherent　particles　under　the　impact.　The　results　reveal　that　the　morphological　evolution　of　oil　droplets　during　impact　spreading　is　jointly　affected　by　factors　such　as　wall　inclination　and　impact　velocity.　Asymmetric　spreading,　unilateral　neck　jet　fragmentation,　or　sliding　spreading　of　wrapped　particles　may　occur.　When　the　particles　don’t　show　significant　slip　along　the　inclined　plane　under　the　impact　of　oil　droplets,　an　increase　in　the　inclination　angle　promotes　the　spreading　of　the　oil　droplets　forward,　making　it　easier　for　a　unilateral　neck　jet　to　break　near　the　three-phase　contact　line　at　the　leading　edge.　When　particles　slip,　the　slip　velocity　of　particles　increases　with　the　increase　of　wall　inclination　angle,　which　shortens　the　length　of　the　liquid　film　at　the　front　end　and　suppresses　the　generation　of　jet　phenomenon,　resulting　in　the　phenomenon　of　wrapped　particles　sliding　and　spreading.　The　impact　speed　has　little　effect　on　the　variation　of　spreading　factor　during　the　post　spreading　process,　while　the　maximum　spreading　factor　during　the　pre-spreading　process　gradually　increases　with　the　increase　of　impact　speed.　The　movement　of　particles　attached　to　the　wall　is　significantly　affected　by　the　impact　velocity　and　inclination　angle.　An　increase　in　the　impact　velocity　or　inclination　angle　can　promote　the　sliding　of　particles　wrapped　in　the　impact　oil　droplets　along　the　wall.　©　2024　Chinese　Society　of　Theoretical　and　Applied　Mechanics.　All　rights　reserved.