Abstract: Based on a detailed job analysis of nuclear power plant operator including operation procedures analysis, interview with personnel familiar with operator job, and 9 events happened in the past in the plant involved operator error analysis, several operator work characteristics and performance influence factors are obtained. According to these specific characteristics and factors, referring to the psychological selection research results in the other related critical occupational fields, a full psychological selection system of nu-clear power plant operator is forwarded in this paper, including 21 dimensions in 3 facets as general psycho-logical ability, personality and psychological healthy. Practical measurement methods for the proposed selection dimensions are discussed in the end.