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The electromagnetic environment of UHV project keeps a close relationship with the environment protection and project cost, so it would catch the full attention after its operation. To well research the electromagnetic environment level and discipline of UHV AC transmission line, a detailed test in the widen areas was carried out, including power frequency electric field, power frequency magnetic field and radio interference. The results showed that, the measurement values of power frequency electric and magnetic field were basically the same as theoretical calculation results. The distribution of radio interference was consistent with the calculation result, but there were differences in the quantity. The actual radio interference level was 2.5-4.5dB(μV/m) lower than the calculation result by CISPR generation function formula. By comparing with fair-weather and foul-weather, radio interference in the condition of fair-weather was 16-19dB (μV/m) less than that in light rainy day.