Rail milling is an effective way to repair rail profile and eliminate rail surface damage. The repairment of rail profile through milling is realized by arranging the cutter grains on the facing cutter according to target rail profile, and then driving the rail milling train to mill longitudinally along rail surface. The profile of rail milling depends on the arrangement and layout of the cutter grains. The characteristics of facing cutter and its combination of cutter grains are restored using 3D scanning technology based on reverse engineering; The layout of cutter grains is adjusted according to the designed 60D rail profile and its fitting degree is verified. Finally, the field test of the designed 60D profile facing cutter shows that the single milling amount is about 1 mm in the range of -10°~+10° at the top of the rail head, and the milling error is less than 0.3 mm.