Abstract: DLP (Digital Light Processing)is a kind of 3D printing technology which is building layer by layer by surface exposure. In the 3D printing process of DLP, when the thickness of the layer is determined, the printing accuracy of the part mainly depends on the exposure time and building direction. A test sample is designed to study the influence of single-layer exposure time and part building direction on the printing accuracy of different features in the process of printing jewelry resin materials by DLP process. The results show that, for the used jewelry casting resin, when the exposure time is small, the curing is not enough, which leads to larger size error. When the single-layer exposure time is set at 9.5 s, the printed feature accuracy is better; The printing error of features with the same size is different when the building direction is different. When the axis direction of square tube, circular tube, cone and semi cylinder and the height direction of inclined prism are the same as the slicing direction, the step effect can be avoided and the contour accuracy is higher.