Abstract: The property of dual defect modes,induced by one-dimension photonic crystals containing absorbing defect layer with zero average refractivity,was studied based on the eigen matrix.The results show the transmissivity of dual defect modes varied with the extinction coefficient,and the transmissivity at high or low frequency defect mode became maximum as the extinction coefficient reached a certain value.However,the transmissivity at high or low defect frequency mode could not reached maximum value at the same time.In addition,the position of absorbing material might affect the response curve of dual defect modes.The conclusion will play an important impact on the application of photonic crystals.