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The flow structures of a supersonic flow over a cylinder with a finite height are investigated using the method of flow visualization with nanoparticle-based planar laser scattering (NPLS),in a supersonic quiet wind tunnel at Ma =2.68.The complex structures of shock waves and three-dimensional vortices in a supersonic flow over a finite cylinder are visualized.Based on the time correlation of NPLS images,the time-space evolutionary characteristics of the coherent structures in a supersonic flow over a finite cylinder are studied,and the evolutionary characteristics of the coherent structure in the flow direction are obtained,which are used to identify the model and rotation direction of shedding vortices.