A　novel　method　of　metal　fused-coating　additive　manufacturing　(MFCAM)　was　proposed　aiming　at　the　high　cost　and　low　forming　efficiency　of　the　existing　metal　additive　manufacturing　equipment.　Sn63-Pb37　alloy　was　used　in　this　basic　experiment,　and　the　influences　of　flow　rate,　deposition　speed　and　layer　thickness　on　the　surface　morphology　characteristics　of　multi-layer　single　pass　specimen　were　analyzed.　The　surface　quality　of　formed　parts　was　improved　through　the　analysis　on　these　process　parameters.　The　bonding　state　between　layers　of　multi-layer　single　pass　specimen　was　evaluated　combined　with　waviness　by　using　microscopic　image　observation.　The　forming　efficiency　can　reach　50　mm3/s,　and　the　arithmetical　mean　deviation　of　the　cross-section　profile　is　0.944　8.　The　feasibility　and　efficiency　of　the　MFCAM　technology　were　verified.　©　2018,　Zhejiang　University　Press.　All　right　reserved.