The paper makes modal analysis and structural modification of chaotic vibrating screen, and puts forward some noticeable problems on the structural design of screen box.[Descriptors] Chaotic vibrating screen Modal analysis Structural modification Screen box Structural design The paper makes modal analysis and structural modification of chaotic vibrating screen, and puts forward some noticeable problems on the structural design of screen box. [Descriptors] Chaotic vibrating screen Modal analysis Structural modification Screen box Structural design