Laser-arc　hybrid　welding　is　a　promising　technology　which　can　be　widely　used　in　industry　and　it　attracts　attention　of　the　researchers　worldwide.　Combining　two　heat　sources　with　different　physical　properties　and　energy　transmission　mechanisms　together,　laser-arc　hybrid　welding　possesses　the　composite　advantages　of　laser　welding　and　arc　welding.　Some　aspects　on　laser-arc　hybrid　welding　such　as　the　laser-arc　interaction,　droplet　transfer　characteristics,　dynamic　behaviors　of　the　keyhole　and　the　weld　pool,　hybrid　welding　processes　and　their　applications　are　reviewed.