Trichloroisocyanuric acid white crystalline powder, slightly soluble in water, is an efficient disinfection, sterilization, and bleaching agent. It has strong disinfection and bleaching effects. Its efficiency is higher than that of ordinary chlorinating agents, and it is particularly suitable for disinfection and sterilization of water. After dissolving in water, it is hydrolyzed into hypochloric acid and cyanuric acid, without secondary pollution. It is an efficient and safe disinfectant and bleaching agent.