Based on the shape，volume and area of dent in multi-layered target created by kinetic projectile explosive, the damage effect was analyzed. The damage zoning was founded in multi-layered target. The experimental data were analyzed, then relation curves of diversified damage parameter with blasting depth worked out by using the dimensionless method. Through those relation curves, the blasting depth corresponding to the optimal damage effect can be found easily. This method can generalize to other blasting damage effect analysis.