Laser　welding　between　Kovar　alloy　and　DM308　Mo　glass　using　YLS-6000　fiber　laser　was　performed.　The　effects　of　process　parameters　on　joint　strength　and　interface　microstructure　were　studied　as　well　as　diffusion　behavior　of　interface　elements.　The　result　shows　that:　(1)　When　the　laser　power　is　700-800　W,　the　welding　speed　is　4.5　mm/s　and　the　focal　distance　is　0　mm,　the　joint　shear　strength　reaches　the　maximum　value　of　10.97　MPa;　(2)　The　bonding　quality　of　Kovar　alloy/DM308　glass　is　generally　good.　A　thin　reaction　layer　was　observed　at　the　interface.　The　boundary　between　the　welded　seam　and　the　substrates　is　clear.　Microcracks　exist　in　some　positions　of　interface　due　to　the　presence　of　a　lot　of　pores　in　the　glass　side;　(3)　Under　high　temperature　conditions,　the　element　diffusion　is　more　uniform,　the　more　Fe2SiO4　is　generated　at　the　interface　reaction,　and　the　joint　strength　is　the　higher.　©　2018,　Editorial　Board　of　Transactions　of　the　China　Welding　Institution,　Magazine　Agency　Welding.　All　right　reserved.