Dynamic globularization behavior of lamellar structure in the TA15 alloy was examined by isothermal constant strain rate compression testing on thermal simulator with strain rate of 10-3～1 s-1 and true strain of 0.22～0.92 at 900 and at 950℃.The results reveal that with increasing true strain from 0.22 to 0.92,the globularization rate of alpha phase is increased by 40%,showing obvious effects of true strain on dynamic globularization.At a given true strain and strain rates,globularization rate of alpha phase exhibits slight difference with deformation at 900℃ and at 950℃,keeping in range of-7%～7%.When strain rate is in range of 10-3～10-1 s-1,with decreasing in strain rate,globularization rate of lamellar alpha phase is greatly improved,while strain rate is more than 10-1 s-1,globularization rate is nearly independent of the change of strain rate.True strain-true stress curves of TA15 alloy are characterized by flow softening at different strain rates and temperatures,which is attributed to the dynamic globularization and kinking of lamellar alpha phase.