A finite element model for deflection of reinforced concrete flat plates is presented. In this paper, a layered degenerated shell element was adopted for finite element analysis. The proposed finite element model account for material non-linearities, uncracked concrete is considered as an isotropic linear elastic material, and after cracking, the concrete is considered to be an orthotropic material. The finite element model of this paper was verified comparing with existing experimental results. It is shown that a good agreement between proposed model and experimental results. A parametric study also has been conducted to verification of influence of several parameters in terms of the reinforcement ratio, boundary condition, modulus of rupture. The deflection of reinforced concrete flat plates varied depending on the reinforcement ratio, boundary condition.