Abstract: Rotating Biological Contactor (RBC) is practical equipment for waste　water treatment. Owing to the defects of disk material of conventional RBC, such as lower specific surface area,lower speed of growing biofilm and lower efficiency, a new type of disk material of paper cross flow was selected． The OSZ1224 NetRotating Biological Contactor was developed with the disk material of paper cross flow. The equipment has many advantages, such as higher efficiency with 1.25m^３／h of waste water treatment, lower energy consumption. It is suitable for the treatment of any kind of organic waste water.