The three-dimensional (3D) dark with high uniform light wall is very useful for many applications such as 3D dark spot microscopy and 3D dark spot trap. A new method is proposed to generate a 3D dark spot surrounded by uniform light at all directions. In this method, a double-ring-shaped radially polarized beam and a single-ring-shaped azimuthally polarized beam are incoherently superimposed. When two component beams of the composite beam have a proper intensity ratio, a 3D dark spot with high uniform light wall can be generated by focusing the composite beam. Compared with the result obtained from a single double-ring-shaped radially polarized beam focusing, the uniformity of the light wall surrounding the 3D dark spot obtained from the superimposed beam focusing can be increased twice or more.