This　study　investigates　on　the　characterization　and　joining　behavior　between　glass　and　KOVAR　alloy　with　fiber　laser.　Due　to　the　different　chemic　bonds　and　thermal　expansion　coefficients,　the　oxide　layer　plays　an　essential　role　in　this　process.　First,　surface　treatments　under　different　conditions　have　been　discussed.　It＇s　indicated　that　when　the　two　textures　(the　square　block　and　the　strip　phase)　appeared　on　the　KOVAR　surface,　the　joinability　of　KOVAR　alloy　enhanced.　Then,　considering　about　three　laser　process　parameters　(beam　scan　speed,　laser　power　and　focus　position)　by　the　orthogonal　experimentation,　the　result　indicated　that　the　possibility　of　this　joining　technology.　Finally,　the　fractures　graphs　were　observed　by　LEXT　OSL　3000.　By　analyzing　the　FeO-SiO(2)-Fe　phase　diagram　and　XRD　on　the　fractures,　it　displayed　that　a　new　chemical　substances　(Fe(2)SiO(4))　had　formed　which　was　considered　as　the　key-materials　for　a　good　glass-to-KOVAR　alloy　joint.