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Sand/dust test is one of the key projects to examine the environmental adaptability of ordnance equipment. In order to decrease the abrasion of test facility caused by the sand/dust particles, the particles contained in the airflow need to be reclaimed effectively. A mathematical model of U separator is established. The flow field and the trajectories of particles inside the separator are obtained using a numerical simulation method, and the separation efficiency and pressure drop of separator with different rows of separate components are also obtained at various flow velocities. The simulation results indicate that the efficiency of U inertia separator is affected by the flow velocity evidently, and a reasonably designed separator can meet the requirement of the separation efficiency in particular situation. The results can be use as reference for the design and test of sand/dust separate systems.