Due to the limitation of model coloring process, 3D solid sand table cannot satisfactorily restore the color information of electronic sand table, which has become a technical bottleneck for the development of solid sand table model to higher accuracy and color restoration. This paper mainly studies the coating treatment of three-dimensional spray painting surface; independently prepares the coating solution, coating the three-dimensional surface, analyzes the physical properties and printing properties of the coating; solves the problems of ink absorption, ink color rendering and dot expansion of three-dimensional spray painting coating; and improves the color reduction of three-dimensional spray painting. The specific research conclusions are as follows: with the decrease of pigment particle size, the whiteness of the coating first increases and then decreases, the contact angle of the coating gradually decreases, and the color density of the coating gradually increases. When VAE-707 and SBR are used as adhesives, the whiteness of the coating is improved; with the decrease of the ratio of VAE-705 to PVA-1788, the whiteness decreased first and then increased. When the ratio of VAE-705 to PVA-1788 was 2:8, the whiteness was higher. VAE-707 as adhesive has the highest color density, followed by PVA-1799; When the ratio of VAE-705 to PVA-1788 is 6:4, the color density of the printing coating is higher and the ability of tone reproduction is better.