本研究欲探討在美國市場中WTI油價與美元指數間之非線性關係及在俄羅斯市場中URALS 油價與盧布對美元匯率間之非線性關係。本研究包含單根檢定(穩定性檢定)、非線性門檻檢定、共整合檢定、和因果關係檢定。實證結果與分析發現，油價與貨幣皆為定態。同時，油價與貨幣於兩個市場中，在長期下，皆有共整合關係。此外，此關係於美國市場中為對稱；而於俄羅斯市場，則有門檻不對稱之情形。最後，本研究發現油價於短期和長期，皆有領先美元之情形。 The research investigates non-linear relations of WTI oil price and US Dollar Index on the US market and URALS oil price and RUB/USD exchange rate on Russian market. The study includes unit root test (stationarity test), non-linear threshold cointegration test and Granger causality test. The empirical results and analysis suggest that oil prices and national currencies are all stationary. Also, oil price and currency are co-integrated in the long run on both markets. Apart from that, the relationship is symmetric on the US market and threshold asymmetric on Russian market. Finally, oil price leads US dollar in the short run and in the long run.