Disclosed are a method for improving the uniformity of a flat panel light source and the light source thereof. It achieves a diffusion effect by blurring the lighting surface of the light module, thereby makes the outgoing lights more uniform. The blurring process can be performed on the inner or outer surface of a lighting substrate before a flat panel light source is assembled. Otherwise, the blurring process may be performed on an outer surface of an assembled light module. The invention is applicable to a field emission display (FED) back-light or front-light module. The lighting surface of a cathode plate module is blurred for an FED back-light source, and the lighting surface of an anode plate module for an FED front-light source.