Abstract: The study researches kinetics of UV disinfection of reclaimed water,and obtained relevant parameters.It shows that the bacteria reaction order and the total coliform reaction order are very close to 1,when the turbidity is less than 15 NUT and the initial consistence of bacteria is less than 1.0×10⁶ CFU/mL.The ultraviolet disinfection process can be viewed as first order kinetics of optical biochemistry.The first sterilization rate constant of bacteria equals to 0.220-0.309 cm²/(mW·s),and that of total coliform equals to 0.327-0.340 cm²/(mW·s).