In　modern　industrial　fields,　there　is　a　tendency　that　more　and　more　components　or　structures　are　compositely　made　of　dissimilar　materials,　which　offers　challenges　to　the　joining　technology.　In　this　paper,　a　review　of　laser　beam　welding　of　some　dissimilar　materials　is　presented　based　on　our　research.　The　dissimilar　material　combinations　include　W-Cu　PMM/stainless　steel,　brass/copper,　brass/steel,　aluminium/titanium,　and　aluminium/copper.　To　join　W-Cu　PMM　and　stainless　steel,　the　laser　welding　process　with　filler　powder　was　conducted.　Firm　welds　free　of　cracks　are　successfully　obtained　using　Ni35　as　the　filler　material.　Laser　deep　penetration　welding　is　achieved　in　the　joining　of　brass　and　copper　with　a　Nd:YAG　laser,　adopting　lap　joint　with　brass　on　the　right　side,　by　utilizing　the　easily　vaporizing　of　the　zinc　element　in　brass.　For　the　joining　of　dissimilar　materials　with　great　differences　in　the　melting　temperature　and　metallurgical　properties,　such　as　brass-steel,　aluminium-titanium,　and　aluminium-copper,　a　so-called　laser　penetration　brazing　(LPB)　process　has　been　proposed　and　researched.　The　substrate　with　lower　melting　temperature　is　penetratingly　melted　by　the　focused　laser　beam　while　the　substrate　with　higher　melting　temperature　is　still　kept　in　the　solid　state.　The　melted　metal　wets　the　butt　joint　surface　of　the　solid　substrate　to　form　a　brazing　joint.