A simple fast algorithm is proposed for visualizing multiple three-dimensional (3D) obstacles from the knowledge of the near-field measurements of the scattered field for point source field.The proposed algorithm is achieved by using the 3D contour plot of the solution of a linear system as a visualization of the scattering object.An attractive feature of this algorithm is that it avoids the use of the iteration technique and does not need any priori knowledge about the geometry and physical properties of scatterers.In addition,the algorithm only requires the knowledge of the near-field measurements of the scattered field at a finite number of incident and observation points distributed over some limited area.Some numerical examples based on synthetic near-field data are given to show the practicality and efficiency of the inversion approach.