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The investors at the process of making investment decisions direct their investment to different sectors through different securities. Although the sectoral choices may be differentiated, the main objective is to optimize the risk. At that point the investors direct their investments by considering the efficiency borders. At the point where efficiency borders end, the Capital Asset Pricing Model (CAPM) appears. The Capital Asset Pricing Model shows the relationship between expected return of any security and its risk. This model is a guide for investors especially at the process of measuring systematic risk. In this study a hypothetical portfolio was created at the Istanbul Stock Exchange and the risk of that portfolio was measured by using Capital Asset Pricing Model. After that risk decomposition was made by purifying the risk of the stocks from total market risk and by this way the systematic risk level of market was measured. [ABSTRACT FROM AUTHOR]