For physical science, physics experiment is established based on the theories of physics, is added to determine the establishment of new concepts, physics and the new rules that relies on repeated experiments, and experimental data processing or determines the final results of experiments with real value. University physics experiment is not big, but the difficulty is that people often confused for processing experimental data. This will be the first to explore experimental operation process error, error and uncertainty, through all kinds of experimental data, how to deal with these data to try to reduce the error and the real value.Keywords: experimental data processing, the error theory, the uncertainty