The　14　mm　thick　EH36　high　strength　steels　are　welded　by　the　fiber-laser-MAG　hybrid　welding　process.　The　effects　of　laser　power,　welding　speed　and　welding　current　on　the　weld　formation　are　investigated　and　the　microstructures　and　perfomances　of　welded　joint　under　the　optimal　process　parameters　are　analyzed.　The　results　show　that　the　weld　penetration　increases　and　the　weld　width　is　basically　unchanged　with　the　increase　of　laser　power.　With　the　increase　of　welding　speed,　the　weld　width　decreases　and　with　the　increase　of　welding　current,　the　weld　width　is　basically　unchanged.　Under　the　optimal　welding　process　parameters,　the　weld　formation　is　good　and　there　are　no　welding　defects.　The　microstructures　of　the　heated　affected　zone　and　weld　zone　are　mainly　composed　of　lath　martensite.　The　hardness　of　weld　metal　is　greater　than　that　of　the　base　metal.　The　fracture　position　of　the　tensile　specimen　is　within　the　base　metal.　There　are　no　cracks　on　the　tensile　surface　after　the　transverse　bending　test.　The　fracture　morphology　of　weld　impact　specimen　is　quasi　cleavage　fracture.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.