Abstract: We designed a triple-band metamaterial absorber basing on the electromagnetic resonance. The absorber consists of an electrical ring resonator and a split wire. Simulation results show that the absorber has three distinct absorption peaks. The absorption rates are 94%, 79% and 73% at the frequencies of 8. 06GHz, 4. 76GHz and 12. 3GHz respectively.Then,we apply the hybrid optimization algorithm, which include the continuous ant colony optimization and the differential evolution strategy, to optimize this absorber around 4. 9GHz and 11. 85GHz. After optimization, the absorption rates are more than 95% around these two frequencies.