A　3D　computational　model　of　the　splat　formation　process　was　established　to　simulate　the　flow,　heat　transfer　and　solidification　of　a　Ni　droplet　impacting　on　the　surface　of　mild　steel　substrate　with　the　computational　fluid　dynamics　(CFD)　software　Fluent.　The　governing　equations　were　discretized　according　to　typical　finite　volume　method　(FVM).　A　volume　of　fluid　(VOF)　tracking　algorithm　was　used　to　track　the　droplet　free　surface.　Meanwhile,　the　simulated　results　were　visualized.　The　results　indicated　that　the　maximum　pressure　was　found　at　the　impact　point　at　the　beginning　of　impact.　The　pressure　distribution　inside　the　deformed　droplet　during　the　spreading　which　came　from　the　impacting　was　in　the　shape　of　a　mushroom　cloud,　and　the　impact　pressure　decreased　from　the　impact　point　to　the　top　side　of　the　droplet.　The　fluid　spreaded　radially　outward　during　flattening　which　was　accompanied　by　impact,　consequently　two　symmetrical　vortices　appeared　in　the　velocity　vector　field.　Correspondingly,　the　temperature　distribution　in　the　deformed　droplet　exhibits　＇camel-hump＇　shape　associated　with　the　combined　interaction　of　the　substrate　conductivity　and　convective　heat　transfer　of　the　melt　droplet.　The　occurrence　time　of　the　maximum　spreading　velocity　raised　from　the　impacting　delay　of　0.03　μs　compared　with　that　of　the　maximum　impact　pressure.