The invention discloses a processing method for determining the grey level distribution of video images and a method of dynamic processing of video images. The processing method for determining the grey level distribution of video images comprises the following steps: equally dividing the grey level of a frame video signal to multiple zones; calculating the pixel quantity of a frame video signal in each grey level zone; and determining the grey level distribution of the video image. The invention overcomes the disadvantages of the prior art, can dynamically reduce the backlight brightness without changing the brightness of the majority of the image, can reduce the energy consumption of liquid crystal TV while, and provides better visual effect to the television viewer.