Selective Laser Sintering (SLS) is one of the most rapidly growing Rapid Prototyping (RP) processes, mainly due to its ability to process various materials. Prototypes made by SLS are widely used in product development as they can be used for product testing. Prototypes, therefore, should have a appropriate surface finish for functional performance as well as aesthetics. However, prototypes made by the SLS process have comparatively high surface roughness due to the stair stepping effect. From the strength aspect, Glass Filled (GF) Polyamide is also being used. However surface roughness model for GF Polyamide as a material for laser sintering has not yet been reported in the literature. Surface roughness of the prototypes depends on the various process parameters. This paper attempts to study the effect of process parameters, namely build orientation, laser power, layer thickness, beam speed, and hatch spacing, on surface roughness. Laser power, layer thickness and orientation were found to be the three most important parameters efecting surface roughness of the parts. Empirical models have been developed for estimating the surface roughness of the parts.