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The 3D shape of radar beams is drawn by direct volume rendering (DVR) algorithm based on 3D texture. Two procedures based on graphical processing unit (GPU) are explored to optimize the algorithm. In order to probe into the internal details of radar beams, three volume clipping methods are proposed, geometry-guided clipping, isosurface DVR and exploded view based on texture-space transformation, which provide approaches to research the electromagnetic energy distribution of radar beams in a visible way. Experiments show that algorithms proposed by this article can vividly depict the spatial pattern of radar beams and supply the intuitional and dynamic scene at interactive rate.