Abstract: Ultrasonic echo of interface between FGH96 powder metallurgy superalloy and K411 alloy manufactured by laser direct deposition was studied. The reason of the variable amplitude of interface reflection was analyzed. Tensile tests were carried out on the specimens taken from position with different ultrasonic reflection at room temperature. The fractures of the specimens were observed and the grain orientation of K441 alloy was measured by EBSD. The results show that tensile performance of the samples from position with different ultrasonic reflection nearly has no change. There is no significant correlation between echo reflection and tensile properties. The amplitude variation of echo reflection is mainly caused by the orientation of K411 alloy grains. The interface of FGH96 powder metallurgy superalloy/K411 alloy may produce pseudo-defect display with equivalent of φ1.2 mm flat bottom hole.