To calculate reflectance of anisotropic composite laminates reinforced with magnetic coating carbon fibers, is the basis of the study on absorbing properties of the structural absorbing materials. Propagation constant and wave impedance of electromagnetic wave in unidirectional anisotropic composite laminates is derived, and reflectance performance of multidirectional anisotropic composite laminates is then derived using transfer matrix method. According to the above derived methods, a kind of reflectance optimization software is developed for multidirectional anisotropic composite laminates with variable parameters such as directions, frequencies, laminate layers, thickness and etc.