Design experiment refers to that designed and conducted by students independently and is surely an important method to cultivate students' comprehensive quality. According to the development and requirements of experimental teaching, this article carries out a study and analysis on the purpose, significance, denotation, connotation and characteristics of design experiment and then elaborates on the general design methods and specific steps in this kind of experiment. By practicing in design experiment, students will have their abilities in innovation and scientific research as well as comprehensive engineering diathesis improved.