Abstract: The manufacture and utilization of iron ware marked the entry of human civilization into a new historical period. The study of iron relics can help researchers gain a deeper understanding of ancient societies. With the development of science and technology,more and more new technologies have been applied to the study of iron cultural relics. As a new CT technology,spectral CT with energy resolution has a broad application prospect in the study of iron cultural relics. In this paper,spectral CT is applied to the quantitative analysis of iron cultural relics. Then,material decomposition is used to estimate the composition ratio of base material in the iron cultural relic samples. Two groups of iron cultural relics are used for experiments in this work. Experimental results show that spectral CT has high application value in the quantitative analysis of iron cultural relics.