In this paper, the time-displacement response of Reinforced Concrete (RC) slab subjected to impact loading was investigated through the Finite Element (FE) modeling in which the Concrete Damage Plasticity (CDP) model was employed. The main parameters of the current study were the thickness of the slab (100, 150, 200, and 250 mm), the area of tension reinforcement, and the area of compression reinforcement. Results showed that the slab thickness and the tension reinforcement area significantly influenced the time-displacement response of the RC slab under impact loading. On the other hand, the compression reinforcement area showed almost no significant effect on the time-displacement response.