This paper is oriented toward discussing some problems experienced in food extrusion and particularly analyses the problem of existence of the `molten pool'in question.

The conception,principle,characteristic,history,course of development,extrusion process system,structure and classify of extrusion machine,basic process of extrusion,production technology and application about food extrusion technology were summarized in this paper.

Three-dimension parametric model design of food extruder screw based on UG;

Presenting the way and elementary theories on AutoCAD re-development with object-oriented and ActiveX technology, showing an example of food extruder screw design system development, related questions on AutoCAD re-development had been analyzed and researched, also discussing the application for carrying on food extruder screw design parameterized With .

This paper briefly discussed the history and principle and production technology and distinguishing feature of food extrusion technology, and research progress about food extrusion technology: firstly, development in application field; secondly,use of new technology and improvement of technology; thirdly, research about mathematics model.