The small deflection of the two dimensional functionally graded material (2D-FGM) thin plate (Ti-6Al-4V, Al 1100 and ZrO₂) is analyzed by the finite element method(FEM).The deflection value of 2D-FGM thin plate subjected to uniform distributed load with four edges simply-supported or clampedsupported is calculated under different temperatures. At the same time, the accuracy of this method is examined. The deflection distribution diagrams are obtained. Effects of temperature and porosity on the deflection of 2D-FGM thin plate are discussed. The results show that the influence of temperature and porosity on the load 2D-FGM thin plate is obvious. In the case of constant ambient temperature, the deflection of 2D-FGM thin plate with four edges clamped-supported and four edges simply-supported increases with the increasing of porosity. Under the condition of constant porosity, the deflection of 2D-FGM thin plate with four edges clamped-supported and four edges simply-supported increases with the increasing of temperature.