In order to study the velocity, mass and damage characteristics of reinforced concrete slab, fourteen blast tests were carried out on three thickness targets. The initial velocity of fragments is obtained by image capture, based on the dimensional analysis, the quantitative relationship with the collapse coefficient is established. Statistical analysis of test results show that no matter what failure mode occurs to the target with limited thickness, the mass of single fragment produced is mainly less than 60g, of which the fragment below 30g is mainly single stone, and the fragment between 30g and 60g is mainly sand-stone cement. The smaller the Kz is, the smaller the scale and the mass of the single fragment is. The damage state analysis of the equivalent simulant show that the single concrete fragment can’t penetrate the 25mm thick plank effectively. The damage of wood board is mainly impact damage and marks on the board surface. Due to the limited strength of the fragments themselves, some fragments are likely splintering or smash in the process of impact on the target, which makes it impossible to continue to penetration. Although a single piece of fragment can’t penetrating into the board, it has a large number and a large density per unit area, which is easy to cause a large area of skin injury to personnel. The sustained impact times of fragment’s ejection on the target can be as long as 200ms-500ms ,which can cause damage accumulation ot the target and eventually lead to serious damage of the target or casualties.