The dynamic recrystallization of TC16 titanium alloy was investigated by isothermal constant strain rate compression deformation test at 750

9

50 ℃ and strain rate of 1

1

0s

-1

.The flow stress constitutive equation of TC16 titanium alloy was established based on the stress-strain curve.The dynamic recrystallization critical strainε

c

was derived from the curve of strain hardening rate to strain（θ-ε）.The experimental results reveal that the decreasing amplitude of flow stress at 700

8

50 ℃is larger than that at 850

9

50℃at a fixed strain rate.The recrystallized grain size in microstructure of the alloy is further refined at deformation rate of 50% with the high strain rate（such6）ε=10s

-1

).