The circular gradient neutral density filter (referred to as the circular gradient density filter) can linearly attenuate the light intensity by rotating the filter, and can accurately adjust the light energy in the circular linear direction, while maintaining the neutral spectrum light energy distribution. Under the premise, the light energy can be adjusted and controlled. This type of filter can be used in natural light and laser fields. Using two filters in combination, reverse rotation can obtain a fixed density attenuation effect in a large limited area. Product sizes are available from 25mm to 100mm. Spectral range 250nm-2500nm. Density sheets with special size, density and wavelength can be customized.