Abstract: In this paper, x80 pipeline steel was treated by three aging ways. The influences of heating time, heating temperature and prestraining on the transition from continuous yield to discontinuous yield in stress-strain curves were studied. Meanwhile, the correlation of the discontinuous yielding curves and the tensile performances of x80 pipeline steelwere also studied. Furthermore, amodifiedHockett-Sherby (H-S) modelwas proposed to simulate the stress-strain curves of discontinuous yield. The results indicated that the simulative results agree with the experimental results.