Abstract: The deformation distribution and the load-deflection characteristic of high-strength steel fiber reinforced concrete square slab subjected to punching shear were obtained experimentally. It is assumed that the deformation of slab before punching shear failure is primarily caused by bending moment. The deformation not only reflects the flexure behavior of slab at every loading stage, but also affects the stress status on the surface of punching shear cone and the ultimate capacity of the slab. In this paper, the deformations of punching shear slabs at three loading stages before failure are calculated. Good agreement between the theoretical values and the testing curves is reached.