This paper is concerned with the Non-linear behavior of reinforced concrete slabs at high temperature at service loads. Layered degenerated shell element is used to predict the complex feature of structural behavior at high–temperature condition, such as thermal expansion, cracking, crushing, yielding and changing of materials properties with temperature. In the development of FE model, the geometrical nonlinearity is considered, the layered element are modified to allow for temperature distribution and change of materials property through thickness. Predictions from this analysis are compared to the available experimental results and good agreements obtained.