Abstract: Based on the former achievements, the principle of a new complicated functional system or large instrument repository is put forward. The principle is demonstrated by the first proposed rock model. Theoretically the rock model unifies all mechanical measuring instruments by integrating them into one system; Therefore it has the property of “border without limit”. Based on the model principle, by multiple and deep integrative manufacture of measuring functions and instruments, dividing and combining different layers, complex measuring systems can be readily built and stored into a large instrument repository which can be put into practical use.

Key words: Large instrument repository, Mechanical measuring system, Rock model