Abstract: In order to fabricate specific morphology and size on a mold by means of the laser texture, and explore the mechanism of the formation of topography, a three-dimensional transient model of the laser texturing process was established based on the Fluent software. The temperature field and flow field of molten pool were calculated, and the experimental parameters were determined:laser power density 2.04×10⁴W/mm²~3.57×10⁴W/mm², pulse width 100μs~1000μs. The thermal conductivity, thermal convection, thermophysical properties of materials and other factors were considered. The enthalpy method was used to deal with the boundary of solid-liquid phase transition, the laser heat source was loaded through user defined function. Based on numerical simulation, the influence of laser power density and pulse width on the morphologies and geometrical parameters of laser texturing were studied by varying a single factor with nitrogen gas as the auxiliary gas. Spherical crown, concave crown and M shape were obtained. The results have guiding significance for mold texturing.