Abstract: Compared with the traditional operation interface, the digital man-machine interface of the nuclear power plant has changed greatly, and has become more complicated in many aspects, which undoubtedly affects the operator’s situation awareness and personnel performance. In order to identify the problems in the current digital interface and provide theoretical support for the design and optimization of the man-machine interface of the nuclear power plant, the relevant personnel of the digital nuclear power plant was surveyed in this paper. The content of the questionnaire involved six aspects of the digital man-machine interface, which were information display system, digital SOP system, soft control system, alarm system, operator support system and situation interaction. Through the analysis, it is found that the current digital interface is insufficient in the information distribution, risk prompt, operation difficulty and auxiliary functions of the operation screen, and the overall scene interaction effect is not good, which needs to be optimized and perfected.