Abstract: In order to design optical filter with high quality, dual-channel optical filter in quaternary-heterostructure photonic crystal (ABC)⁷D (CBA)⁷ was constructed by using transfer matrix method and the characteristics were studied. The results show that, with the increasing of D_A(or D_C), the filtering quality factor of short wave channel decreases and quality factor of long wave channel increases. With the increasing of D_B, both the filtering quality factors of short and long wave channels decrease. With the increasing of D_D, quality factor of short wave channel increases and quality factor of long wave channel decreases. With the increasing of optical thickness, both channels of the filter are red shifted toward long wave. Optical transmittances of each filter channel remain constant perfectly. The study can provide the reference for the design of new optical filters and optical switches of photonic crystals.