The area and volume of dent in concrete covered and bitumen concrete covered multi-layer targets that created by semi-armour-piercing projectile blasting were tested. The deforming process of blasting funnel and the damage effect of multi-layer targets were discussed. Theory analysis and high-speed photograph indicate that, after blasting, radial cracks appear firstly, then circular cracks appear, and the radial cracks impenetrate with circular crack forming fracture zone. The range of radial crack is larger than that of circular crack. Experimental results indicate that the optimal blasting depth of semi-armour-piercing projectile in concrete covered multi-layer targets is less than in the other targets, which can be helpful to optimize the fusee in projectile. The largest dent volume and dent sectional area in bitumen concrete covered multi-layer targets created by semi-armour-piercing projectile blasting are larger than that in concrete covered multi-layer targets.