Uneven radiant quantity along the radial and different ink curing speeds of all sorts of color ink appear in the process of rotating painting ink UV-curing. In view of these problems, a design using the UV LED with two kinds of different wavelengths is proposed to form a fan- shaped array on a cylindrical surface. The curing system can achieve even curing along the radial, and the technique problem of different colors of ink curing at the same curing time is solved. The simulation result shows that the UV LED curing system meets design requirements with Tracepro and is important for further expanding the application field of UV LED.