The Theory of Practice is a philosophy that has been proved repeatedly by extremely successful practice, and its basic ideas are widely applicable to the process of practical activities. Technical majors have a variety of practical teaching process, is a common basic activity in students"cognition, students realize the leap from perceptual to rational knowledge through practical training; students use the knowledge they have learned to counter-practice in society after graduation, to complete the second leap in cognition. At the same time, the theory of practice has a good guiding significance for solving some problems and troubles in study and work.