Trade index has Survey on the real exchange rate for time series data of 1978- 2011. So, Mundell-Fleming and Dornbush Model used for analysis of exchange rate. Real exchange rate estimated by Vector Auto Regression model ( VAR ). The result show, trade index has positive effect on the real exchange rate. So, it suggested using the appropriate commercial policies in trading of goods and services to create a suitable qualification of determination exchange rate by government policies