The design values of the materials’ property parameters were adopted customarily in researches by far, which failed to take the influences of construction quality into account. A method for the seismic response analysis of RCC dam considering the influences of construction quality is proposed in this paper. Firstly, based on the real-time monitoring data of compaction quality of RCC dam, the physical and mechanical parameters under the impact of construction quality were analyzed; then, a finite element model considering the influences of the construction quality was established; finally, combined with a practical project, the seismic responses were calculated. The results show that the influences of the construction quality on the seismic responses can be analyzed with this method, and thus, it can provide more scientific evidences for the anti-seismic design of RCC dam.