Strip gradient neutral density filter (referred to as strip gradient density filter) can linearly attenuate the light intensity by moving the filter or light source. To achieve precise adjustment of light energy in the length direction of the strip, and to maintain adjustable and controllable light energy on the premise of maintaining the neutral spectrum light energy distribution, it is divided into metal alloy type variable density sheets and low inversion type variable density sheets ( GND). It is suitable for both ordinary light sources and laser light sources. When the two plates are used in combination with reverse translation, the attenuation of the light of a larger beam spot can be achieved. Optional use of spectral range 250nm-2500nm. Density sheets with special size, density and wavelength can be customized.