Based on oversea successful experience in the modular construction technology of raft foundation reinforcement cage (RFRC) for reactor building in nuclear power plants, this modular construction technology for the reactor building in CPR1000 nuclear power plant is studied. Through the comparison and comprehensive evaluation of four kinds of modular design schemes of RFRC, a recommended scheme is proposed, and a special spreader was researched and developed for the RFRC modular construction. Furthermore, the RFRC modular construction scheme of a demonstrative project which will adopt the RFRC modular construction technology is studied, including the selection of cranes for lifting modules and crane positioning, construction site requirement for modular construction. The research results would lay a technological foundation for the all-round implementation of RFRC modular construction in nuclear power plants in China.