According to the problems in weak relevance between practice and teachingof separate setup of Mechanical Principle and Mechanical Design,big difference between practical contents and real engineering demand,inadequate systematic understanding and mastering of mechanincal comprehensive design of the students and so on,based on the analysis of connotation system of mechamics-like subject competition,this paper points out reform method by using subject competition to boost mechanical comprehensive curriculum design in order to realize the connection between urriculum design teaching contents as well as vertical interaction between teaching organizations,to let the students overall know thw four stages such as conceive-design-implement-operate in mechanical system design and to make the reform more conducive to cuotivating students' mechanical comprehensive design ability,innovative ability and practical ability.