This paper takes the engineering graduation design as an entry point, deeply analyzes the problems about the lack of knowledge coverage and incomplete course system in the current engineering teaching curriculum, based on the analysis of the credit composition of a certain engineering major and the investigation of graduation design issues. Then paper discusses the resulting problems in the graduation design process, including the superficial grasp of the problems, segmentary knowledge system, the need of course re-learning and etc., and thus proposed the thinking to build teaching system from three levels concluded professional knowledge, curriculum system and promotion requirements.