Abstract: In order to further explore the realization method of 3D printing, and to get a promotion in the precision and efficiency, based on the structure of the plotter, combined with the stereolithography (SLA) technology, a new stereolithography plotter ( SLP) design was presented for 3D printing with photosensitive resin. Its movement structure was similar with the plotter, and laser focus part did xy two-dimensional motion directly. Its focus length was much shorter than that of SLA, so its power requirement of light source was lower. Compared to the SLA and digital light processing ( DLP), its work field can be extended more easily.