Objective To develop evaluation index system for core competencies of specialty nursing educator in clinical teaching base. Methods Through literature review,qualitative interview based on grounded theory and expert consultation,the preliminary evaluation index of core competence of specialty nursing educator in clinical teaching base was preliminary formulated. From May 2024 to July 2024,the Delphi method was used for two rounds of expert consultation,and the weights of each indicator were calculated using the analytic hierarchy process. Results The response rate of the two rounds of questionnaires was 100%. The authority coefficient of experts was 0.920,0.866,and the coordination coefficients of expert opinions was 0.200 and 0.242(P<0.001), respectively. The evaluation index system for core competencies of specialty nursing educator in clinical teaching base was finally formed,which included eight primary indicators,22 secondary indicators and 64 tertiary indicators. The eight primary indicators included personal characteristics,specialty theoretical knowledge and application ability,clinical specialty work ability,clinical teaching ability,interpersonal communication and coordination ability,nursing scientific research and innovation ability,ethical/legal awareness,and other ability. Conclusion The core competency evaluation index system for clinical teaching teachers in specialty nursing teaching bases provides a basis for the selection, training, assessment, evaluation, and management of clinical teaching teachers. In addition,it provides reference for further optimizing the training mode of nursing educator in clinical teaching base and establishing an echelon of specialty nursing educator in the teaching base.