We discuss the long time behavior of solutions for a three-dimensional non-autonomous Brinkman-Forchheimer equation in 3D bounded domains. We obtain the existence and reveal the structure of the uniform attractors for the processes associated to the fluid in V, when the external force  is translation compact in  And, we also investigate the Brinkman-Forchheimer system with oscillating forces  possessing the averaging  as  where  With assumptions  on the functions  and  we prove that the Hausdorff distance between the uniform attractors  and  in V, corresponding to the oscillating equations and the averaged equation, respectively, tends to zero as

Brinkman-Forchheimer equation, uniform attractor, oscillating external forces.