In this paper, we devote to investigate the electromagnetic (EM) radiation characteristics and radiation intensity of high power weather radar once extensively. We compare our field measurement with international specifications and an operating early-warning radar case study also made a contribution to those who are interested in the healthy effect of high power EM radiation. The measured data is much lower than the recommended specifications announced by EPA and ICNIRP. It shows that no direct evidence can prove that radiation may cause harms to human beings.