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The wide-band frequency EM noise is generated during the processes of firing and turn-off of thyristor valves in converter stations. It will be conducted along the primary circuitry, and may interfere with secondary systems by the way of conducted and radiated coupling. The plusmn800-kV UHVDC transmission project is one of newly developed technique and used barely in the world. The EMI problem is one of most important issue that should be studied deeply in the stage of designing. A method of conducted EMI analysis based on time- domain wide-band circuit simulation, as well as a method of radiated EMI analysis based on the Method of Moments, are proposed and verified in the paper. The EMI level of a plusmn800-kV converter station, which is planned and being designed in China right now, are presented.