On the basis of experiments,the nonuniform models of modulation of refraction index and variation of spatial frequency are obtained by using nonuniform coupled-wave theory.The nonuniform distribution characteristics of the filters having high diffraction efficiency and narrow bandwidth are analyzed on the nonuniform model,and a method for improving properties of notch filter is proposed.The holographic notch filters with high optical density and narrow bandwidth are fabricated using dichromated gelatin ;DCG .The characteristics of these filters are that the optical density of peak wavelength is between 4 and 5,and the half-bandwidth is smaller than 20 nm.