Abstract: In this paper, a Section Profile Disassembly Reasoning StrategySPDRS in computer aided cold roll form designing is developed Considering the variability and complexity of cold roll formed sections, the SPDRS is created to solve the problem of the representation of graphics information and that of the establishment of reasoning engine, which is the foundation of universal designing of roll contours for various sections. and which enables the application of Expert System in CARD. Based upon the concept of "Shape Element", the SPDRS is the art in which the forming characteristics of all kinds of shape elements abstracted from various profiles is and through which the recognition of graphic information and the reasoning of forming strategy are realized.