Prediction of final microstructures after high temperature forming of Ti-6Al-4V alloy was attempted in this study. Using two typical micro structures, i.e., equiaxed and Widmanstatten microstructures, compression test was carried out up to the strain level of 0.6 at various temperatures (700 similar to 1100degreesC) and strain rates (10(-4) similar to 10(2)/s). From the flow stress-strain data, parameters such as strain rate sensitivity (m) and activation energy (Q) were calculated and used to establish constitutive equations for both microstructures. Then., finite element analysis was performed to predict the final microstructure of the deformed body, which was well accorded with the experimental results.