A management method of a powder supply head in which supplied cladding metal is stabilized, and a method and apparatus for forming an erosion shield. The powder supply head has a double tube that supplies the cladding metal to a cladding portion and includes an inner tube that sprays a cladding metal used for cladding by welding and an outer tube that concentrically overlaps the inner tube and sprays a shielding air. The method including: spraying the cladding metal from the powder supply head to a test region; measuring a width of the cladding metal sprayed onto the test region; in a case where the measured width of the cladding metal is an allowance or smaller, determining that the powder supply head is usable, and in a case where the measured width of the cladding metal is greater than the allowance, determining that the powder supply head is unusable.