In this paper, the industry courses and the key-elements of driving intelligent-manufacturing-system (IMS) development have been reviewed. Focusing on the requirement of discrete-manufacturing with mass-varieties and small-batches, we analyze the structure, components and elements of IMS, discuss the principle, design methods, and the key-technology about IMS, put forward the model of modularization-intelligent-unit, and finally, give example models of manufacturing process and structure of mechanical-processing, provide reference for the application of intelligent manufacturing in aviation industry.