The　3D　morphology　of　rough　surfaces　is　crucial　for　the　study　of　the　mechanical　properties　of　bolted　joint　surfaces.　This　article　uses　fractal　statistical　methods　to　discuss　the　distribution　patterns　of　characteristic　parameters　that　characterize　micro　convex　bodies.　This　model　combines　the　fractal　theory＇s　ability　to　describe　rough　surfaces　with　the　randomness　introduced　by　Monte　Carlo　methods.　Based　on　the　study　of　rough　surface　morphology,　the　following　conclusions　can　be　drawn:　fractal　dimension　D　and　feature　scale　coefficient　G　are　negatively　correlated　with　the　contour　of　rough　surfaces.　As　the　fractal　dimension　D　increases　and　the　characteristic　scale　coefficient　G　decreases,　the　fluctuation　degree　of　the　micro　convex　body　decreases,　and　the　surface　becomes　smoother.　In　addition,　the　fractal　dimension　D　has　a　more　significant　impact　on　surface　contour　compared　to　the　feature　scale　coefficient　G.　©　2024　SPIE.