The superplastic behavior of TA32 titanium alloy plate at 950 ℃ in vacuum environment was studied at a range of strain rate from 5. 32 × 10~(-4) s~(-1) to 2. 08 × 10~(-2) s~(-1). The results show that,the characteristics of true stressstrain curves and microstructure evolution of TA32 titanium alloy plate are significantly different under different strain rates. Under the deformation condition of low strain rates( 5. 32 × 10~(-4)～ 3. 33 × 10~(-3) s~(-1)),the true stress-strain curves exhibit typical feature of traditional steady-state superplasticity,and the grain sizes of primary α phases are increased after deformation. While under the deformation condition of high strain rates( 8. 31 × 10~(-3)～ 2. 08 × 10~(-2) s~(-1)),the flow stress rapidly monotonically decreases until fracturing after reaching the peak point,and the grain sizes of primary α phases are significantly finer than those at low strain rates as result of dynamic recrystallization refinement.TA32 titanium alloy plate shows excellent superplastic deformation ability at 950 ℃ with an elongation to fracture from 145% to 519%. At the strain rate of 5. 32 × 10~(-4) s~(-1),it has the biggest elongation of 519%. It is found that the superplastic fracture mode of TA32 titanium alloy plate is the aggregation-linkage-growth of vacancies.