With the increasing complexity of the electromagnetic environment (EME), it is necessary to perform actual measurement and evaluation of the EME. Because of the temporal dynamic and random variation of the EME, time variation characteristics of the EME in a campus are considered in this paper. By choosing sampling points in different regions of the campus, respectively measuring electric field value of the sampling points during different time periods, and using statistical analysis of the measurement data, we get the figures of probability density distribution and time variation curve of the electric field. And then, the time variation characteristics of the actual EME are analyzed and discussed, the distributions of the EME in different regions are compared, as well as a brief evaluation of the electromagnetic radiation level in the campus is given.
