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It is especially difficult to capture both exterior and interior shape data of a complex part with high accuracy and low cost by using the current reverse engineering measuring methods. This paper presents a novel cross-sectional imaging measurement system for reverse engineering based on existing NC milling machine, which can simultaneously acquire the full cross-sectional contours of a part with complex external and internal surfaces. The principle and architecture of the system are described. Furthermore, some key issues to implement the measuring system are discussed in detail. Finally, a real case is employed to illustrate the applications of the system. As a result, this system provides a feasible and useful scheme for many enterprises to construct their own reverse measuring system based on existing equipments to aid rapid product development and extend the function of existing equipments. It will potentially find widespread application in industrial reverse measurement due to its advantages including high accuracy, rapid construction and low cost.