Abstract: The laser welded lightweight sandwich panel ( LASCOR) structure has many advantages , including weight saving ,smaller space , lower noise and vibration , improved fireproofing , enhanced thermal insulation , improved impact resistance , lower manufacturing cost with precise prefabricating method , easy and quick assembling. Utilizing laser welding can reduce welding distortion and increase productivity , as well as improve corrosion resistance of the weld. It has widely been used for deck , bulkhead, elevator door , hangar door ,and jet deflector panel in a naval ship ,deckhouse and platform of an offshore platform , bridge faceplate ,car ,train ,and construction etc. The results obtained in the US Navy and the shipbuilding industry of European countries are summarized in order to provide a reference to Chinese researchers in this field.