Abstract: Objective To construct the competency evaluation index system for medical nursing assistants in China. Methods Based on literature analysis，open questionnaire and semi-structured interview，the competency evaluation index system for medical nursing assistants was initially formulated. 21 experts were consulted by Delphi method in September-November 2021，and the index weight was calculated by analytic hierarchy process. Results The effective questionnaire recovery rates of the two rounds of expert consultation was 80.77% and 100.00%，the expert authority coefficient was 0.914 and 0.912 respectively，and the Kendall coefficient was 0.134-0.341（P<0.01），forming the competency evaluation index system including 5 first-level indexes，14 second-level indexes and 56 third-level indexes. The weights of the five first-level indexes of theoretical knowledge，operational skills，social ability，professional attitude and personal characteristics were 0.108 2，0.388 8，0.166 3，0.269 2 and 0.067 5，respectively. Conclusion The competency evaluation index system for medical nursing assistants is relatively scientific and reliable，which can provide reference for the training，assessment and evaluation of medical nursing assistants.

Key words: Nursing assistant, Medical nursing assistant, Competency, Evaluation index