Abstract: Al5Ti1B master alloy refiner was prepared by the reaction of complex halide salts with molten aluminum at high temperature. The manufacture process and parameter range were regulated and the principle and course of the reaction were analyzed. As for the self-made master alloy, the Ti content reaches 4.64%, and B 0.84%. The self-manufactured product was compared by comprehensive evaluation with the products manufactured by KBM, LSM and some national organization. It is found that TiAl₃ particles are less than 50 μm, and TiB₂ less than 1μm in the Al5Ti1B master alloy developed by Tsinghua University and Baotou Aluminum Plant. Its refining performance is closed to KBM's Al5Ti1B. The self-manufactured product reaches the international standard in composition, microstructure and refinement effect.