Purchasing Power Parity Theory as a theory of determining the exchange rate or a Iong-run balance relationship has a significant role not only-for developed but also for developing countries which apply freely floating exchange rate system especially after 1980's. in this study, in the light of theoretical framevvork and literatüre review, absolute and relative purchasing power parity are tested by unit root and co-integration tests for the Turkish economy. Findings have shovvn that relative purchasing power parity is verifıed in the Iong-run for the US Dollar rate of Turkish Lira.