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We study the entropy of Schwarzschild black holes on a Dvali-Gabadadze-Porrati (DGP) brane. The radius of the event horizon on a DGP brane is obtained by using a numerical method. It is smaller than that of Einstein gravity in the conventional branch and is larger in the accelerated branch. However, the di erence is very small. The entropy of the black hole is calculated by using the improved brick-wall method.