In this thesis we examined the influence of the institutional changes and the implication of the financial evaluation of athletes (level and structure) on the level of dosing athletes. The most important moments in the history of the anti-doping fight were founding of WADA (World Anti-Doping Agency) and the acceptance of the law against doping. Hypothesis 1 examined, if the founding of WADA (standardization of the anti-doping fight among countries) have had an influence on the decrease of the level of dosing athletes in these countries. According to the regression analysis we can say that the foundation of WADA had have the influence on the level of dosing athletes, but not in the direction we supposed. Some countries adopted the anti-doping law, which led us to formulate the Hypothesis 2: the level of doping athletes has been decreasing since the acceptance of this law. Due to econometric analysis we cannot support this hypothesis. We stated two more hypotheses in the chapter dedicated to the financial evaluation of athletes. Hypothesis 3, that the sport with a lot of supporters (in consequence lot of sponsors) is less prone to doping, we can support. Last hypothesis of this thesis is Hypothesis 4 and states that the level of the doping is influenced by the structure of the athlete evaluation. We cannot accept this hypothesis after the consideration of the available data set.