Abstract: A new projectile/sabot aerodynamic separating technique in hypervelocity impact experiment is developed. By using this technique, the Al spheres with diameters of 3 mm to 10 mm are separated with sabot successfully in the velocity ranges of 3～7 km/s, on the two-stage-light-gas gun with 18 mm caliber in the Beijing Institute of Spacecraft Environment Engineering. This technique is favorably compared with the existing sabot separating results.