After a brief introduction to the contents, method and meanings of cybernetics and control engineering with a brief historical remark, Professor Qian Xuesen's《Engineering Cybernetics》is introduced with special emphasis on its contents, paradigms, and the important role it plays in the development of control theory from the “Classical” to the “Modern”. In the preface he stated , “Engineering cybernetics is an engineering science, which aims to organize the design principles used in engineering practice into a discipline and thus to exhibit the similarities between different areas of engineering practice and to emphasize the power of fundamental concepts”. With his modern work on systems engineering, large-scale systems, complex systems and complex giant systems, a new frontier of control science will be formed to meet the challenges of complexities in modern society and technologies