This paper deals with a method for automatic generation of intermediate manufacturing information required for linking the result of design with the tasks in process planning. The method is characterized as that such manufacturing information is derived from the designer's intention expressed in the form of functional descriptions and their related geometries, both of which can be preserved in the product design stages in the CAD system. In order to describe the designer's intention in a unified way, we develop a descriptive frame work to represent the functions of the design object by three types of basic functions about a face element; function of (1) transmission, (2) constraint, (3) fixation, and by two items of functional properties such as the mechanism utilized for realization of the basic function and the condition and direction of the motion. By using this representation, the intermediate manufacturing information can easily be obtained. To confirm the validity of the method proposed in this paper, a prototype system of intermediate manufacturing planning has been fabricated. An appropriate result is obtained. This work is carried out under full consideration to realize the integration of CAD and CAM.