Aim: The aim of this study is to survey the effect of FIFA 11+ injury prevention program on dynamic bal- ance and knee isometric strength of female players in soccer super league. Method: Sample of study included 30 subjects of female players of Shahrdari Bam, super league soccer team. 11+ injury prevention training proto- col should be completed within eight weeks, at least two times a week and approximately 20-25 minutes. Lower extremity strength is assessed by using dy- namometer device and dynamic balance test was evaluated (in the pre-test and post-test) by star test (SEBT). For data analysis, descriptive statistics of paired t and independent t test at significant level of p<0/05 were used. Result: Research finding indicates that 11+ injury prevention training program led to a significant in- crease in flexion and extension strength of knee joint and dynamic balance in the posterior and pos- tero-lateral directions in the experimental group (p>0/05). There was a non-significant increase in the other directions and the control group P≥ 0.05. Also there was a significant difference between the experimental and control groups in posterior and postero-lateral posterior (p =0/001). But there was no difference in the control and experimental groups in other directions. Also a prominent difference was observed between experimental and control group in flexion and extension strength of knee (0/001). Conclusion: Because the 11+ injury prevention pro- gram includes special soccer movements, plyomet- ric, strength and balance training, it has an effect on muscular strength and dynamic balance in pos- terior and postero-lateral directions in professional soccer players. It can also be a preventive factor in lower extremity injuries because of increasing knee strength. Key words: 11+ training, strength, balance, soccer, female

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