The aim of the work is to analyze the theoretical basis of determination of the market risk premium in conditions of the national market in the Czech Republic with CAPM and practical procedures of its determination using the market data provided by Bloomberg. The work addresses some open problems of practical determination of market risk premium as a choice between historical and implied risk premium, determination of credit spread as a representative of country risk and accurate determination of the equity and bond market volatility ratio. The thesis also contains research on the cost of equity and single-factor sensitivity analysis demonstrating the significant influence of a small change in one parameter entering the calculation of the discount rate on the resulting value.