In order to investigate the impact of social support on post traumatic growth and to test the mediating role of psychological resilience between social support and post traumatic growth after 10 years of Wenchuan earthquake, 997 high school students were tested by social support questionnaires, post-traumatic growth inventory, and the Connor-Davidson resilience scale. The results were as follows: 1) social support had a significant positive predictive effect on post-traumatic growth, and psychological resilience played a partial mediating role between social support and post-traumatic growth; 2) there was no gender difference in the intermediary process of social support and post traumatic growth, but the social support of girls had a greater predictive effect on their psychological resilience than that of boys. In conclusion, social support can not only directly and positively affect post-traumatic growth, but also indirectly and positively affect post-traumatic growth through psychological resilience. Effective social support and psychological resilience contribute to post-traumatic growth of adolescents.