Grain refining experiments for casting of pure At were conducted to evaluate the grain refinement performance of an Al-5mass%Ti alloy refiner before and after cold rolling. Al3Ti particles in the Al-Ti alloy refiner were efficiently fragmented by cold rolling. The size of the Al3Ti particles in cold rolled Al-Ti alloy refiner decreased from 280 mu m to 30 mu m with increasing reduction ratio of cold rolling. Mean size of alpha-Al grains in pure Al cast refined by the cold rolled Al-Ti alloy refiner decreased from about 500 mu m to 200 mu m with increasing the reduction ratio. In order to investigate mechanical property of the pure At cast refined by the cold rolled Al-Ti alloy refiner, Vickers hardness test and tensile test were conducted. Strength of the pure At cast refined by the cold rolled Al-Ti alloy refiner increased with increasing the reduction ratio. The strength improvement of pure At cast refined by the cold rolled Al-Ti alloy refiner followed Hall-Petch relationship. From obtained results, it was concluded that cold rolling for refiner is useful practical application for pure Al cast.