It is of great theoretical value and practical significance to research radio electromagnetic interference(RI) in UHVDC Valve Hall, given the study on its level and the measures that is taken to reduce it. In this paper, . In this paper, the structure of ±1100 kV converter station valve hall and its main RI source is analyzed。And then, the RI model for its evaluation is built which is based on the current model, solved by the method of moments(MOM).Finally, taking the actual project as the research object, based on parameters of the current element model are obtained though the PSCAD simulation, the level of RI in ±1100 kV converter station valve hall is evaluated by using FEKO. This paper provides a basis for the measures for RI suppression of UHVDC.