Objective To apply the train-the-trainer(TTT)mode in the course of Tactical Combat Casualty Care,so as to improve rescue skills of combat injuries and cultivate group training skills in military college students.Methods Forty students of the 2021-2022 academic year were initially trained for rescue skills of combat injuries and instructional skills.After passing the instructional competency assessment,13 students of them were selected as student instructors to conduct trauma care skill training for 40 new students of the 2022-2023 academic year.After training,a questionnaire survey was carried out in the students of the 2021-2022 academic year,and in-depth individual interview was performed in the 13 student instructors.Results The total score of TTT model training was 4.60±0.44.The score of trainee's satisfaction was 4.53±0.51,and 97.5%of trainees expressed willingness to participate in the TTT model training again.Three themes were extracted through the interview,including self-requirement and active learning,multi-dimensional ability training,and mutual understanding and empathy.Conclusion The TTT mode as an effective teaching method to cultivate group training ability can promote the development of multi-dimensional abilities such as the knowledge,skills and group training ability of combat injury rescue,and cultivate training personnel for self and mutual medical aid.