The present study has been realized as a part of currently ongoing research project “Psychological Correlates of Coping in elite Athletes in The Czech Republic” (MUNI/A/0839/2016). Regular participation in sport provides specific conditions for athlete’s physical and mental development, socialization and development of personality traits. Elite sport is associated with high level of stress, excessive load and pressure from parents, coaches and peers that focusses on high performance and success. Long-term intensive training accompanied by stress, fatigue, lack of rest and exertion before and during competitions are main predictors of overload of young elite athletes and can contribute to development of overtraining syndrome. Purpose: The aim of the study is to map personality traits in young elite athletes, to compare personality traits across different groups of athletes (individual and team sports, male athletes and female athletes) and to examine possible relationships between selected personality traits and overtraining syndrome in young elite athletes. Methods: Big-Five Inventory, Profile of Mood States questionnaire. Implications: The main implication of the study can be seen in closer integration of theoretical knowledge and practice based on further cooperation with coaches and improvement in the prevention of overtraining syndrome. Preliminary results support the assumption about the connection between personality traits and overtraining syndrome. The complete results of this study will be presented at the conference.