To investigate the influence of coherent structures in the gas-particle wake flow, direct numerical simulation (DNS) method was adopted to compute a two-dimensional particle laden wake flow. A high accuracy spectral element method (SEM) was employed to simulate the gas flow field and a Lagrangian approach was used to compute the particles movement. Numerical results showed that at the same Stokes numbers, particles would be greatly impacted by the development of the coherent structure.But with different Stokes numbers, it can be seen that the large-scale vortex structures would influence the particle flow differently.While under different Reynolds numbers (150 and 200), there are no great changes in the particle laden flow.