The transmission properties of asymmetric cascade photonic crystal were calculated and studied by transmission matrix method theory.The results show that for the cascade mirror symmetrical photonic crystal,there appears a single transmission peak(the transmittance is 100%) in the band gap,and the single transmission peak is more and more refined and moves toward the long wave direction with the increase of the number of the cascade,but the transmittance remains constant .For the asymmetric cascade photonic crystal,the transmittance of single peak declines rapidly and its position moves to the short wave direction with the increase of the number of the cascade or the cascade cycle asymmetry.The transmission of single peak declines slowly and its position moves rapidly to short waves direction with the increase of the cascade structure asymmetry.The transmission properties of asymmetric cascade photonic crystal have a certain reference value for the design and research of optical filter,optical total reflection mirror and optical switch.