Ag　nanomaterials　have　been　investigated　as　a　filler　material　for　brazing　Inconel　718　well　below　the　bulk　melting　temperature　of　Ag　using　both　vacuum　and　laser　brazing.　However,　Ag　nanoparticles　and　Ag　nanowires　exhibit　different　bonding　strengths.　In　this　study,　we　focus　on　different　diffusion　and　wetting　behaviors　of　two　kinds　of　nanopastes.　At　550　degrees　C,　the　areal　coverage　of　the　nanopaste　decreases　as　a　result　of　shrinkage　in　the　nanopaste.　The　shrinkage　is　followed　by　rapid　wetting　and　spreading　on　the　Inconel　718　surface.　A　deeper　investigation　to　the　diffusion　behavior　of　Ag　nanoparticle　and　Ag　nanowire　pastes　during　laser　brazing　provides　a　clear　correlation　between　the　diffusion　distance　and　the　bonding　strength.　The　diffusion　of　the　base　material　into　the　Ag　joint　is　shown　to　result　in　a　concentration　＂hump＂　near　the　Ag-Inconel　718　interface　of　different　base　material　elements　which　is　likely　caused　by　a　difference　in　diffusivity　of　Ag　and　the　Inconel　718　constituent　elements.　Ag　NW　joints　were　found　to　have　a　thicker　diffusion　zone,　but　also　exhibit　some　Nb/Mo　segregation　when　brazed　using　300-W　laser　power.　This　may　lead　in　different　metallurgic　bonding.