The multiwave mixing effect in the azobenzene compounds was observed by means of three dimensional degenerate four wave mixing geometry. Except for three pump beam spots, the symmetrical 14 spots arrayed on the output screen was observed firstly. The signal spots were thought to be induced by cascaded effect. The qualitative theoretical explanation based on multiwave mixing and weak beam amplification effect has been given. The phenomenon will be used widely in optical computing, image process and optical interconnect.