Abstract: Photocatalytic material is a kind of semiconductor material that can efficiently convert ultraviolet light and visible light energy in sunlight into chemical energy， so as to achieve effective degradation of pollutants. Photocatalytic technology with graphitic phase carbon nitride （g⁃C₃N₄） as catalyst has broad application prospects in solving problems such as environmental pollution and energy shortage. The effective degradation of pollutants on the surface of cement‑based materials can be achieved by applying it to the surface of cement‑based materials. The methods of optimizing g‑C₃N₄ modification by non‑metal， metal doping and co‑doping were reviewed， the application status of g‑C₃N₄ and its modified products in cement‑based materials and the application mechanism of photocatalysis were discussed， and the problems facing the application of photocatalytic materials in cement‑based materials were summarized， and the future development direction was prospected.