When conducting expert review, there should be at least 3 grading review experts, including: remote network security personnel, senior appraisers in evaluation institutions and other network security experts. During the evaluation, network operators introduce their own information systems, experts review the scoring data, ask relevant questions, and network operators answer them. Finally, the expert will make a determination on the score of the system, issue an expert evaluation opinion and sign it, so that the expert evaluation link is completed.