Abstract: The pressure and air transporting system is used on the FH type separator-mixer to combine separating and mixing machine with air-powder separating system which forms a closed system. When separating, the filter and the air pressure & air amount of the air-blower are adjusted. The machine can separate different kinds of materials. When used as mixer, the air-blower is closed. FH separator-mixer has a novel structure and a correct working principle. It has also many good charactristics such as adaptability, wide application, and excellent performance. The product can save energy and protect environment, and it is not expensive.