Abstract: In this paper,Incoloy 800 Transicnt Liquid Insert Metal-bonding Methods,widly used in space technology,hvae been introduced,and the choosing of insert metal and the alloying of base metal surface have been probed.he bonded joints and their mechanical properties have been analysed.It has been proved that the choice of insert metal could be one of the main factors influcncing the transient liquid insert metal bonding.The optimum amount of the elements,boron,carbon and silioen added to insert metal has been determincd through tests.It has been proved that the using of laser powdering as an approach to base metal alloying is feasible. This approach can reduce the bonding labour intensity and raise working effleieney.But the mechanical properties of the bonded joint can be critically influenccd by the insertlaycr formed,due to the uneven rising and falling in the bottom area of the cladding layer.It has been also verifled that bonded joints without defect can be got by both insert metal bonding and powder bonding.