Abstract: Four types of DD6 single crystal joints with different crystal orientation combination,the bonding surfaces perpendicular or parallel to the principle axis of the single crystal and the crystal orientations of the two bonded pieces completely matched or with some misorientation,were obtained by transient liquid phase(TLP) diffusion welding.The result of testing the stress-rupture property of the joints showed that the crystal orientation of the bonded pieces had little effect on the joint properties,but their matching relationship affected the joint properties.When the two pieces had completely matched crystal orientations,the joints possessed the optimum stress-rupture property which surpassed 90% of the DD6 base metal.When there was difference between the crystal orientations of the two bonded pieces,the results of the joint stress-rupture property test were scattered.