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With the rapid development of electric undertaking and the expansion of town scale, ultra-high voltage (such as ac 1000 kv, dc 800 kv) power transmission lines are coming to our lives. And with the development of ultra-high voltage power transmission line, the ultra-high voltage transformer substation will appear in the place with dense population and the electromagnetic pollution of this transmission and transformer equipment and its infection to the natives arouse the great concern from the society. In the other hand, the natives are afraid of the electromagnetic pollution and oppose the power construction, which brings about many unnecessary troubles. To study the situation of electromagnetic pollution due to the transmission and transformer equipment needs many measurements in the field. This paper focuses on electromagnetic radiation of ultra-high voltage power transmission line. Firstly, investigate the condition of being recognized of electromagnetic radiation and analyze the pollution status of environment and human body due to electromagnetic radiation. And then, study the electric and magnetic field under the transmission line by the method of equivalent charges and put forward the prevention policy to the electromagnetic radiation in the engineering of ultra-high voltage power transmission and transforming.