Objective To construct injury assessment indexes for second victims in patient safety event, and to provide references for comprehensively identifying second victim′s injury manifestations. Methods Taking the Omaha problem classification system as the theoretical framework, the item pool of assessment indicators was preliminarily drawn up based on literature review and panel discussion.A total of 20 nursing experts were selected for 2 rounds of Delphi consultation, in an effort to determine the contents of injury assessment indexes for second victims. Results The response rates in the two rounds of expert consultations were 100% and 95% respectively; the expert authority coefficients were 0.81 and 0.83 respectively.The Kendall coordination coefficients of the second rounds of expert consultation on first-level, second-level, and third-level indicators were 0.478, 0.287, and 0.294 respectively （all P＜0.05）.The finalized assessment index system included 4 first-level indicators （physiological, psychological, social, economic aspects）, 16 second-level indicators and 54 third-level indicators. Conclusion The theoretical basis for the construction of the second victim injuryes assessment indexes is scientific, the formation process is standardized, and the result is reliable.The indexes can provide a reference for comprehensively identifying second victim′s injury manifestations, for further developing second victim-related assessment tools, and for construction of targeted support programs for second victims.