A　numerical　model　of　flow　and　heat　transfer　for　micro-droplet　deposition　forming　was　established　on　7075　aluminum　alloy　by　semi-implicit　pressure-linked　equation　algorithm　(SIMPLE),　and　the　volume　of　fluid　(VOF)　method　with　Piecewise　Linear　Interface　Construction　(PLIC)　was　employed　to　reconstruct　the　free　surface.　The　influence　of　processing　parameters　including　impacting　velocity,　relative　distances　between　two　successive　molten　droplets,　the　temperature　of　the　substrate　and　droplet　size　on　end-shapes　morphology　was　simulated　during　fabricating　7075　aluminum　alloy　by　micro-droplets,　and　the　numerical　models　were　validated　with　experimental　results.　The　results　show　that　the　determination　of　reasonable　impact　velocity　and　droplet　relative　distances　is　the　key　to　obtain　a　good　precision　and　quality.　Better　forming　effect　can　be　obtained　when　molten　7075　aluminum　alloy　droplet　with　100　mu　m　in　diameter　and　the　distance　between　two　successive　droplets　200　mu　m　is　deposited　on　a　stainless　steel　surface　at　350　K　with　velocity　1.5　m/s.　The　simulation　results　agree　well　with　the　experimental　results,　which　reflect　better　the　actual　process　of　droplet　impacting,　spreading　and　solidification　behavior,　and　provide　a　reference　for　the　practical　application　of　the　process.