Abstract: This paper attempts to change the traditional way of thinking theme, and believes that Autumn in Palace is of a kind of "theme structure", which is produced instantaneously through combination of numerous thinking factors in the specific historical esthetic situation. The special nature of "theme structure" leads to the richness of the content of the work, and it is also the fundamental cause of subject variety of a work. At the same time, the "theme structure" theory also provides a feasible method for us to explore the thoughts and contents of other similar works.