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The AlGaN/GaN ultraviolet detector with dual band response is investigated by a self-consistent solution of the Poisson-Schr(o)dinger equation.Because of the polarization effect,the AlGaN/GaN UV detector with dual band response can be realized by varying the exteal voltage.At a low exteal voltage,the detector is mainly sensitive to the short wavelength.When the increasing exteal voltage is larger than the critical voltage,the detector has an obvious dual band response characteristic and the critical voltage is calculated.This characteristic makes nitride-based UV detector a larger potential application to develop multi band response by adjusting the Aluminum mole fraction in the AlGaN layer or even by using the AIGaN/GaN/InGaN heterostructure.