Abstract: To solve the problems such as low design efficiency, low resource integration and limited innovation ability in the nuclear reactor design, the implementation concept for digital reactor technology is proposed. Based on the application study of the digital reactor technology in R&D and design, it is concluded that the establishment of a flexible and expandable framework of digitalized basic platform and a three-dimension collaborative design system based on system engineering, and the implementation of the big data Management based on knowledge engineering are the most important research topics during the application of digitalization technology in the reactor engineering design.