Abstract: The microstructure and the element profiles of the interdiffused layer formed by electron beam self-material brazing of Nb-1Zr alloy to 1Cr18Ni9 stainless steel was examined by SEM, TEM and EDS. It is found that constituent element interdiffusion is strongly occurred through interface between two materials and an interdiffused layer is formed during electron beam self-materials brazing. The transmission electron morphologies of interdiffused layer shows two sets of microstructures in it, one is a strip precipitated phase and the other is a matrix phase based on bulk material. Moreover, the strip precipitation is a full laminated strcture which contains two kinds of full laminated precipitated phases. From indexing of the SADP patterns of precipitated phases, it may conclude that the two full laminated precipitated phases are SADP patterns of precipitated phases, it may conclude that the two full laminated precipitated phases are μ-Fe(Ni) 7Nb 6 and σ-FeCr, respectively, the matrix phase is belong to α-Fe(Cr, Ni, Nb, C) phase.