Three-dimensional printing is also called 3D printing, which usually refers to three-dimensional raster printing. It uses a principle that simulates the distance between human eyes to produce spatial differences. It records pixels at different angles and levels on photosensitive materials, and then uses the composite of grating materials to present a three-dimensional effect on a two-dimensional plane image. Even in virtual reality, through this method, people can clearly and clearly experience the wonderful pleasure of three-dimensional images through direct observation without using any tools. 3D stereoscopic prints, like 3D stereograms, cannot see the stereoscopic effect on a computer. However, after the 3D stereoscopic prints are printed, due to the particularity of the grating material, you can see the 3D effect without wearing 3D glasses! Stereoscopic printing originates from the three-dimensional image negatives provided by stereoscopic photography. Although the theory of stereoscopic imaging has been proposed for more than 100 years, stereoscopic photography has developed to a certain extent during these long years. However, due to the traditional optical principle production and synthesis methods used in the shooting and production of stereoscopic photos, there are great limitations in the application of stereoscopic photos. In addition, the production equipment is expensive, the process technology is complicated, and the production cost is high. As a result, stereoscopic photography cannot be promoted and popularized, and stereoscopic printing also suffers from the long process flow in the prepress plate-making process and the large cumulative errors between processes, which reduces the picture clarity and affects the printing effect. In the 1980s, due to the arrival of digitization, the development of three-dimensional printing was promoted, and the production technology became increasingly perfect and stable. Three-dimensional printing has thus entered a new era. Despite this, the waste rate of three-dimensional printing is as high as 40%, mainly due to the difficulty of plate making color separation and amplitude modulation dot accuracy exceeding 300 lines/inch, and the difficulty of screen line angle and color printing overprinting. In the 21st century, stereoscopic photography has entered the digital age. Stereoscopic multi-image synthesis uses computer software, computer-to-plate CTP technology, and high-precision printing equipment with frequency modulated dots. The three-dimensional printing quality system is guaranteed. This technology is used in packaging and decoration products, commercial advertisements, scientific and educational cartoons, postcards, New Year's cards, anti-counterfeiting marks, trademark tags, mouse holders, various credit cards, etc. Three-dimensional printing will provide us with unlimited business opportunities.