Abstract: By using a visualization method which only shows the grids of the stereo shock zones between unites of the annular clustered plug nozzle,the numerical results were reprocessed.From the visualized images of the three-dimension interference shock,three kinds of topological structures of interference shock and a kind of ridge contour of energy leak were summarized.The performance loss caused by these three topological structures was analyzed with the aid of the experimental data,thus providing a reference for further design.