Considering the domestic and overseas development trend of floating nuclear power plant (FNPP), a dock-based ACP100S FNPP is proposed in this paper to promote the construction of FNPP in China. A preliminary evaluation is conducted in the external event, nuclear reactor design, hull design, economic analysis, water-electric-gas cogeneration, emergency safety, and plant deployment. A two-step construction mode is suggested from “offshore FNPP” to “open sea FNPP”. The dock-based ACP100S FNPP provides a meaningful solution for the early engineering construction in our country. © 2023 Yuan Zi Neng Chuban She. All rights reserved.