A post processing method for smoothed particle hydrodynamics data is presented on basis of Delaunay triangulation.Pairing particle set in scope of each particle in flow field is confirmed,and then discretized by Delaunay triangulation on condition of present pairing particle set,which leads to a set of triangle elements with particles as nodes.At last non material units are filtered.Examples indicate that SPH result with complex boundary conditions and severe deformation of fluid region can be treated.