To further explore the absorption mechanism of cavity resonance,the absorption characteristics of anechoic coating embedding elliptic-cylinder cavities with steel plate and air backing were studied.Based on finite element method,the absorption characteristics of both single-cavity coating and mix-cavity coating were obtained respectively.The results show that the anechoic coating embedding elliptic-cylinder cavities has lower resonant frequencies than anechoic coating embedding cylinder cavities under the same perforated rate.And the bigger the oblateness,the lower the resonant frequencies.On the whole,mix-cavity coating has better absorption characteristics at all frequencies.