Abstract: In order to implement rapid prototyping of Cu-P alloy powder based on selective laser melting,the temperaturefield was simulated by the finite element analysis software——ANSYS before fabrication so that its distribution could be obtained.During the process of simulation,the thermal physical parameters of material at certain temperature were obtained throughinterpolation method,an unequal meshing method was adopted and the thermal enthalpy could be used to replace the latent heat offusion.It shows that the temperature field distribution likes an ellipse and the parameters selected by simulation(a laser power of100W,a scanning speed of 0.25m/s and a beam spot radius of 0.1mm were selected when the layer thickness was 0.22mm) canbe used in selective laser melting.