Microstructures and transformation behavior of TiNi shape memory alloy after high temperature ECAE process have been investigated. It is found that the initial coarse grains were refined after high temperature ECAE processes and short annealing at 750 degrees C. Transformation temperatures of TiNi alloy sharply decreased after two ECAE processes, rose obviously when annealed at 750 degrees C for 5min, and quickly rose back after annealing at 500 degrees C for 2 hours. Reasons for phase transformation behavior changes have been discussed.