Abstract: The Xinjiang-X Combine is the product of Xinjiang United Machine Co.Ltd.,which is a famous product in Xinjiang.In order to accommodate the need in market and enhance the productivity,using the 3D parametric technology is an efficient way. The key of implementation of parametri design is parametric modeling. In this paper the Xinjiang-X Combine Header 3D modeling was established based on Xinjiang-X Combine based on the design of combine header, the application of 3D CAD system and parametric technique in agricultural machine design were researched. It laid the theoretical basis for further establishment of combine header parametric modeling.