Abstract: Using high temperature and high strain-rate coupling split Hopkinson bar,the dynamic mechanical experiment on cylindrical sample of TC6 titanium alloy with equiaxed structure and lamellar structure have been conducted at temperatures of 298—1033K,strain rate about 2500s-1,and their dynamic mechanical behavior have been investigated.It has showed that under the condition of high temperature and high strain rate,equiaxed structure and lamellar structure of TC6 titanium alloy present similar mechanical behavior,i.e.flow stress drops and strain increases with the increasing of experimental temperature.In the temperature range from 573K to 673K for t the former and from 673K to 773K for the latter,the flow stress remains relatively unchanged with the change of temperature.Temperature sensitivity of the former is higher than that of the latter when the deforming temperature below 673K,but lower than that of the latter when the deforming temperature over 673K.