The electromagnetic radiation of high voltage power transmission equipment mainly includes the constant-frequency electromagnetic radiation，electrical noise and corona radiation interference，which can change the electromagnetic environment around. The analytical expressions of electromagnetic environment are derived for the high-voltage transmission lines and substation. And the scattering interference and shielding effect are analyzed. A test method is designed to measure the impact on wireless communication signals. The test results show that high-voltage power transmission equipment may cause interference scattering, which makes radio propagation multi-path effect more significant，thus affecting the strength of remote reception field.