The punching shear resistance of concrete flat slabs is a critical consideration in structural engineering, particularly in high-rise buildings subjected to concentrated loads around column supports. This research aims to conduct a wide-ranging parametric study of the effectiveness of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) and the impact of drop panel dimensions on enhancing punching shear resistance through a comprehensive parametric study. A total of 136 models have been used to investigate the parametric study. The results show that the concrete compressive strength, C-150, C-200, and C-250Mpa up to 46.34%, 53.22%, and 62.8% have higher load carrying capacity and reduced slab thickness respectively than c-20/25, as the aspect thickness of the slab to the thickness of drop panel (St/Dt), increases the load carrying capacity increase, as the aspect ratio of slab covered area to drop coverer area (Sa/Da) decrease the load carrying capacity increase. Flexural reinforcement’s ratio of sixteen specimens is simulated by varying the concrete compressive strength of 150Mpa, 200Mpa, and 250Mpa with the reduction of Flexural reinforcements from the control specimen. The analysis results revealed that the increasing of 150, Mpa,200Mpa, and 250Mpa concrete could effectively accommodate up to 23.78%, 36.57%, and 45.50% reduction of reinforcement respectively. These results confirmed that UHPFRC can be a feasible solution to solve the reinforcement congestion problem finally, the geometry of the drop panel was investigated, including square, rectangular, and circular shapes. The study found that the circular drop panel achieved the highest punching shear resistance, followed by the rectangular panel In this study, the Concrete Damaged Plasticity (CDP) material models with minor modifications were used to simulate the punching shear behavior of UHPFRC slab specimens. Keywords: UHPFRC, Ultimate Load, Crack load, Drop Panel, flat slab, punching Concrete damage Plasticity