This paper is based on the theory of uncertainty, will choose the smallest uncertainty as the ultimate goal, and based on that to choose the optimal experimental theory and experimental program. This study can be designed to experiment, in order to screen out the most appropriate program, which play a role in guiding the theory. This article makes detailed analysis by combining with the practical case. Measurement is an indispensable task for physical experiments, but in the measurement process, the errors are almost inevitable. In the nineties of last century, International Bureau of Metrology specially developed a corresponding guide, China has also developed a measurement error and uncertainty for the relevant guidelines, the guidelines clearly indicate the accuracy of the measurement results should be expressed by using "uncertainty", the education headquarters also made a request for the university's physical experiment, that is, to establish the "experimental evaluation system" of the uncertainty, fully applied to the university's physical experiments. In the study of physical experiments, physical experiment design is one of the very important contents, especially because of the continuous progress of science and technology in recent years, the requirements of talent is also getting higher and higher, so in the study of university physics experiments, innovative experiment research has become increasingly important. Which is carried out mainly through a reasonable and feasible experimental design, and ultimately not only continuously enhance the students' innovative consciousness and innovative thinking, but also make the measurement results more accurate, so as to provide real and reliable measurement data.
