PURPOSE: A shot blast method and an apparatus thereof are provided to maximize foreign material removal efficiency by the increment of foreign material removal area. CONSTITUTION: A shot blast method comprises following steps. A shot is jet vertically to the surface of a workpiece from the lower part of transferred materials using impellers(120). The foreign material is firstly removed in a first chamber(10a). The foreign material is secondly removed in a second chamber(10b) using the same method with a first foreign material removal method.
