This paper aims to compares the forecasting performance of asymmetric and symmetric GARCH models to examining the effects of order flow in explaining exchange rate return. Using the 1-, and 5-minute observations over the period of January 2006 to December 2007. Empirical result shows that: First, lagged-one order flow have predictive negative effect for exchange returns. Second, referring to the GARCH family models that EGARCH model is good for forecasting purpose along with capturing the volatility and the leverage effects.