Abstract: The strategy of hierarchy in relative to the system function and the mechanisms of building and transferring component base are produced as well as the methods of recursive problem and solution redefinition are adopted, beginning with defining systematic function , the spaces that initial problem is decomposed to be existing ones in terms of function definition are established ,which coupling with the resolutions of components in order to search for the initial problem solutions satisfying function requirement. The strategy is applied to the filling material system’s conceptual design to verify its automaticity and validity.

Key words: Complex mechanism system, Conceptual design, Functional reasoning