The finite-difference time-domain method was used to simulate the extraordinary optical transmission in a one-dimensional metal-insulator-metal Bragg reflector. It was shown that when introducing a finite array of periodic grooves on the two surface of metal-insulator-metal waveguide, the photonic band gap and pass band will appear. The position of grooves corresponded to the abdominal position of electric field amplitude distribution at resonance wavelength of the metal-insulator-metal waveguide. It was found that the central wavelength of the pass band is around with the resonance wavelength of the metal-insulator-metal waveguide. By adjusting the geometric structure of the grooves and using asymmetrical multi- metal-insulator-metal Bragg reflectors, a good narrowband filtering effect can be found. The central wavelength of pass band is near the resonance wavelength and the full-width at half-maximum is far less than the central wavelength.The required wavelength can be choosen and the other wavelengths can also be restrained by the proposed method.