Abstract: Attenuation of acoustic emission signal occurs during its transmission to sensors on the aluminum plate. This would bring errors in damage evaluation and source location. In this paper, cause and rules of attenuation are analyzed and attained. In order to analyze the attenuation rules of waves in different frequency, the simulated acoustic emission signals from hypervelocity impact are reconstructed in higher and lower frequency, and their attenuation rules are analyzed separately. Their attenuation rules transmitting on aluminum plate are attained. In addition, rules of attenuation ratio and equivalent amplitude changing with impact velocity are analyzed as well. The results could have some applications in optimization of sensor array and damage evaluation.