The characteristics of wavelength of dark-band valley in the transmitted spectrum of dichromated gelatin (DCG) holographic reflection element against the angles of incident beam are investigated experimentally. The use of holographic reflection element with two groups of peak-intensity planes as the holographic angle-sensitive element (HASE) is presented. The HASE has high angular sensitivity and the property of sensitizing to incident beam within very wide angles. The influences of experimental parmeters including the processing conditions and the ratios of reference to object on the minima and bandwidths of dark-band of transmitted spectrum are also analysed.