As a special infrared optical glass, chalcogenide glass shows great advantages in the application of photonic devices in the mid-infrared band. Laser-induced periodic surface structures, whose periods are close to or less than the incident laser wavelength, have broad application prospects in fabricating micro-optical infrared devices that exceed the diffraction limit. This study investigates the evolution process of the periodic structure induced by femtosecond laser on As₂S₃ glass with a pulse number using two processing methods, single point and laser direct writing. First, the formation mechanism of two different periodic structures (low and high spatial frequencies) formed under low and high pulse numbers was analyzed. Then, a large-area periodic structure was fabricated on the surface of As₂S₃ glass using femtosecond laser direct writing technology, and the optical color properties of the periodic structure were tested and explored.