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The periodically forced spatially extended Brusselator is investigated in the chaotic regime. We explore resonant or non-resonant pattes generated under various forcing frequencies and forcing amplitudes. Resonant spatially uniform oscillation and irregular structures are found. Furthermore two types of regular spatial pattes are generated under appropriate parameters. Our results of numerical simulations demonstrate that periodic force can give rise to resonant pattes in forced systems of spatiotemporal chaos similar to the situation of forced systems of regular oscillations.