Abstract: A combination of various research methods including DSC,SEM and TEM was applied to systematically investigate the effect of re-working on the secondary phases.The results showed that the hot-rolling was conducted in the dual-phase region.In the process of cold-working and followed annealing,β-Zr which formed in the hot-rolling decomposed,leading to the precipitation of fine particles,which resulted in the clusters of tiny compounds.The secondary phases are Zr（Fe,Cr,Nb）₂ with a crystal structure of hexagonal close-packed（HCP）.The atomic percentage ratio of alloying elements,n（Fe）/[n（Cr）+n(Nb],for particles in original sheets is close to 5/3,while it was experiencing a downward trend after the re-working.The particles in the cluster own a higher Nb content with the n（Fe）/[n（Cr）+ n（Nb）] approximate to 1.