Abstract: In order to analyze the impact of fixed and mobile interference sources around radio astronomical observatory site on radio astronomical observations, an electromagnetic compatibility analysis method based on the state of interference sources and the magnitude of radiation is proposed. Firstly, the state of the interference source is determined, and the electromagnetic interference evaluation area is collected according to its type, and the relative terrain of each point from the grid to the telescope is obtained by dividing the area. Secondly, the gain of the radio astronomy antenna pointing to the interference source is combined with the selection of suitable radio wave propagation model from the terrain characteristics to predict the radio wave transmission loss and calculate the power of interference reaching the telescope. Finally, the interference effect of the interference source on the telescope is determined by combining the interference level limit and the direction of the telescope. On this basis, the method is applied to the electromagnetic compatibility analysis and evaluation of the moving state interference source and the fixed state interference source, which provides technical support for the electromagnetic interference coordination and interference compatibility analysis around the radio astronomical observatory site.