The UV radiation is both beneficial and harmful for human health ,but it not visible for human eyeso it needs to be detected. Among various types of UV detectors , photochemical type UV detectors have attractedmuch attention for their simple fabricated process , fast response speed ,low cost and self-powered and so on.lrthis work , commercial P25 nanospheres were scraped on FTO conductive glass substrate and assembledsandwich structure photochemical type UV detectors, Under the irradiation of 365 nm with 35 mW . cm^-2 , theopen circuit voltage of the deviee is 0.576 V, the short cireuit current density reaches 1.045 mA * cm^-2, theresponse rise time is 0.010 s and the recovery time is 0.01 s.Under the periodic ultraviolet irradiation , thedevice also shows a stable and reproducible switching performance.In addition ,the device still shows excellenvisible light blindness characteristics and linear input and output characteristics.