In this paper, we fabricated fluidic devices like micro-channel, pump, mixer and particular gas separator with the technology of stereolithography using RP(rapid-prototyping). The fabricated fluidic devices are expected to be applied to develop Lab-on-a chip type liquid analyzer. Stereolithography technology seems effective for fabricating MEMS(MicroElectroMechanical System) with complicated structure because it makes three dimensional fabrication possible but, exclusive devices are needed to be developed for fabricating even more microscopic MEMS structure.