Objective To develop an evaluation index system for clinical thinking ability in nursing interns. Methods The draft index system of clinical thinking ability evaluation was formed through literature review and group meeting. Twenty-six nursing experts were consulted by emails using Delphi technique. Results The effective recovery rate of the two rounds of expert consultation was 100% and 88%,and the expert authority coefficient was 0.929 and 0.941,respectively. The Kendall coefficient of expert opinion in the second round of expert consultation was 0.293. The evaluation index system of clinical thinking ability of nursing undergraduates was constructed,which included five first-level indicators(critical thinking ability,systematic thinking ability,evidence-based thinking ability,predictive thinking ability,and innovative thinking ability) and 35 secondary indicators. Conclusion The consultation experts are positive and authoritative,and the content of evaluation index is reasonable,which can provide a basis for the evaluation of clinical thinking ability of nursing undergraduates.