Abstract: The nuclear reactor design software verification database system was developed in this paper, aiming at the actual demands of professional data during software verification from many majors, such as reactor core physics, thermal-hydraulic analysis, fuel design, etc. Logic structure and technical framework of the system are presented. The unified data modeling way is adopted to analyze, design and realize the nuclear reactor design software verification database system from three management levels of data, system, and safety management. The developed system solved the drawbacks and deficiencies of the verification data that lack of organization standardization, data repeat-ability, and data low-usage. It provides the vital technical support to finish subsequent jobs of software verification.