PSSDB the floor Profiled steel sheet composite dry board (PSSDB) is a prefabricated construction system of lightweight composite. This composite system consisting of a combination of profiled steel and dry board via mechanical connectors. However, the behavior of PSSDB should be studied so that the slab failure can be known through the finite element method. The aim of this research was to investigate the behavior PSSDB under standard fire curve with a variety of different sizes. In this study was to determine the mode of failure and the stress distribution PSSDB based on the standard fire curve. Next, is to develop a finite element model to simulate the behavior of the PSSDB under standard fire curve. Moreover, by using the model this research would be easier to predict the behavior of PSSDB.by using finite element method with the help of software ANSYS 13.0. The results showed that the thickness of the dry boards and the toppping concrete could last longer than the thickness of the other which is lower. Not only that, the displacement decrease is the because the increase of the slab thickness. In conclusion, the thickness of dry boards and topping concrete is one of the factor that increase the fire resistance of PSSDB. Not only that, it directly helps in increasing the fire resistance rating of a building. I appreciate if anyone can help me to improve my English :) Thanks