Abstract: A vast developing market of extruded food has promoted continual technological innovation of screw machinery for food extrusion in China. In this article, two kinds of triple screw extruder, one whose screw axes are arranged as a straight line, and the other as a triangle, are discussed. According to the meshing regions multiplying doubly in triple extruder, the authors in the light of research on the use of screw type extruders and the properties of food processing, discovered that the extruding press action and output of food production will be increased effectively with multiple screw combinations of small diameter and small ratio of length to diameter. They conclude that the triple screw extruder is superior in technical economics to food processing.