The　joining　of　YSZ　and　sapphire　was　achieved　through　the　utilization　of　nanosecond　laser　pulses.　The　microstructure,　mechanical　properties　and　forming　process　of　the　YSZ/Sapphire　joint　were　systematically　studied.　The　joint　consists　of　an　amorphous　region　guided　by　the　temperature　gradient　and　a　dendritic　recrystallization　region.　The　amorphous　region　is　situated　centrally　within　the　joint,　while　the　recrystallization　region　surrounds　it　in　a　distributed　manner.　The　reason　for　this　phenomenon　lies　in　the　fact　that　the　welding　process　occurring　in　the　central　region　of　the　joint,　and　the　extreme　cooling　prevents　Al3+,　Zr4+　and　O2-　ions　from　forming　regular　crystal　phases.　During　this　study　when　the　laser　power　is　set　at　9　W　and　the　scanning　speed　is　adjusted　to　80　mm/s,　optimal　welding　interface　performance　can　be　achieved,　resulting　in　a　maximum　joint　shear　strength　of　32　MPa.　This　study　provides　a　new　idea　for　rapid　and　efficient　welding　of　advanced　ceramic.　©　2024　Elsevier　Ltd